You look at the sky. It’s wide open. Not a branch in sight. But the Starlink app is lit up with an obstruction warning and your connection is dropping. This is one of the more maddening Starlink problems — and it almost always has a real physical cause that just isn’t obvious from where you’re standing.
Why Starlink Flags an Obstruction You Can’t See
Starlink doesn’t see what you see. Its phased-array antenna tracks a moving swarm of low-earth-orbit satellites across a roughly 100-degree cone of sky — from about 25 degrees above the horizon all the way to straight overhead, in every direction simultaneously. Something blocking just two or three degrees of that cone in the wrong spot triggers an obstruction warning. That “wrong spot” might be a chimney flue you never notice, the lip of your own roofline, a utility pole 80 feet away, bare tree branches in winter, or residual data from your dish’s last location. None of these are visible from your yard the same way the dish experiences them.
The questions people ask when the app says “obstructed” and they’re standing outside staring at a perfectly clear sky.
Because the dish sees a wider, lower field of view than you do from the ground. Starlink must track satellites from as low as 25 degrees above the horizon in every compass direction. When you look up, you’re seeing mostly overhead sky. The dish is simultaneously looking toward the north, south, east, and west near-horizon arcs where obstructions are most common. A chimney that’s 20 feet away but slightly behind the dish, a roofline that clips the northern horizon, or a power pole 100 feet away — all of these fall inside the dish’s required sky cone while appearing completely non-obstructing when you stand at ground level and look up.
Yes — and this is a surprisingly common cause of “clear sky, obstruction warning” confusion, especially for RV users, people who recently moved the dish, or anyone who just set it up for the first time. The dish builds its obstruction map gradually by detecting which satellite passes get blocked. That map can take up to a week to fully update at a new location, and it can still carry remnants of a previous location’s data. To force a fresh start: open the Starlink app, go to Visibility → Obstructions, tap the gear icon, and select Clear Obstruction Map. The dish will rebuild its map from scratch within a few hours to a few days at the new site.
Absolutely — and trees are the number one source of surprise Starlink obstructions. Unlike a roofline that sits at a fixed angle, trees have two problems that make them worse than they appear: they are tall, which means their tops intrude on the low-horizon arc where the dish is tracking satellites; and they change seasonally. A tree that looks fine in January when it’s bare can be a major obstruction by June when it’s in full leaf. Starlink uses Ku-band frequencies (10.7–12.7 GHz), and wet leaves, dense canopy, and even bare deciduous branches in the rain all attenuate the signal measurably — the dish detects each satellite pass getting clipped and logs it as an obstruction, even if the branches look thin and unthreatening from the ground.
Yes — and this is the fix people miss most often because the app says “obstruction” and everyone goes outside looking at the sky. A loose, kinked, or partially damaged dish cable causes signal drops that the system logs with the same symptoms as a physical obstruction. The Starlink cable connects the dish to the router using a proprietary connector, and a connection that feels seated but isn’t fully clicked in, a sharp bend in the cable near the entry point, or a small nick in the outer jacket from where it crosses a roof edge — any of these can cause intermittent signal loss that looks exactly like an obstruction in the app. Inspect the full cable run from dish to router before concluding the problem is in the sky.
This is one of the most common sources of a “false alarm.” The Starlink app’s obstruction map always shows a thick clear band — it looks like a gap or missing section in the circular sky map. This is the geostationary exclusion zone, and Starlink’s own Help Center confirms it is completely normal. Starlink intentionally does not use the portion of sky directly above the equator (from your perspective, roughly a band across the south for most U.S. users) because geostationary satellites operated by other providers sit permanently in that arc. This zone always shows as blank on the map even with perfect, clear sky — it is not an obstruction and does not affect your service. If this is what you’re seeing, there is no problem to fix.
Yes. The Starlink dish self-aligns when it boots — it tilts and rotates to find the optimal position for your location. If the mount shifts after alignment (loose pole clamp, a roof mount that settled, wind stress on a poorly secured bracket), the dish’s physical aim changes even though the motor position stays the same. The dish now has a different sky view than it mapped, and objects that weren’t in the original clear zone start clipping satellite passes. Go outside and physically check that the dish mount is rigid and hasn’t rotated or tilted from where you originally set it. Tighten all mounting hardware, and if the dish has moved, stow and unstow it (via the app) to trigger a realignment.
Heavy rain can — but overcast skies, fog, and light cloud cover essentially do not. Starlink uses Ku-band frequencies that pass through most cloud cover with negligible attenuation. Heavy rain above roughly 25mm per hour causes measureable rain fade because water droplets at Ku-band frequencies physically absorb the microwave signal — this is physics, not a dish problem. In a heavy storm, the app may show obstruction-like symptoms even with “no solid objects blocking” the dish. However, if the sky is clear or only partly cloudy, rain fade is not your cause — keep looking for a physical or cable issue. Light rain, fog, and ordinary clouds have no meaningful effect on Starlink signal quality.
The obstruction map takes roughly one week to fully update because it builds its picture gradually — every time a satellite passes over and the dish notices a clip or drop, it marks that zone. After moving the dish, the previous location’s map doesn’t instantly clear. The app may show red arcs pointing in directions that were obstructed at your old spot but are completely open at the new one. Clear the obstruction map manually: Starlink app → Visibility → Obstructions → gear icon → Clear Obstruction Map. Then leave the dish powered on for several days to let it rebuild accurate data for the new site. Until it rebuilds, the map is partially unreliable but the connection itself is usually already improving.
Every one of these looks like a clear sky from where you’re standing. Each one is common enough that it’s worth checking before assuming the dish or app has a bug.
Trees are involved in the majority of surprise Starlink obstruction warnings. The issue is not just the tree directly overhead — it’s the tops of trees 30, 50, even 80 feet away that intrude into the 25-degree-above-horizon arc. From the ground you’re not looking at that arc. You’re looking up. The dish is tracking satellites sweeping through that near-horizon zone constantly. A single pine branch clipping that arc causes a dropout every time a satellite passes behind it — and there are dozens of satellite passes per hour. Wet leaves and dense canopy attenuate the Ku-band signal even without fully blocking it, which is why deciduous trees that were fine all winter suddenly generate obstruction warnings in May. The fix: use the Starlink app’s obstruction checker at dish height (not standing height), which will show you exactly which direction the tree tops are encroaching.
Anything that sticks up from a roof — a chimney, a plumbing vent pipe, an old TV satellite dish, an HVAC stack, even a dormer — creates a hard obstruction at a very low angle from the Starlink dish’s perspective. Because the dish sits on the roof itself, these features are usually behind or to the side of it and not visible when you look upward from the yard. A chimney two feet behind the dish and two feet taller than it blocks a slice of the northern sky cone at exactly the angle where satellites are frequently tracked. Walk all the way around your roof at dish level (or have someone do it) and look outward from the dish position — not down at it. Any structure that rises above the dish’s height and sits within 20–30 feet is a likely cause.
A utility pole and power lines might not look like much — they’re thin, they’re not solid in the way a wall is. But they’re permanent, precisely positioned, and can clip the exact orbital path satellites travel. Every time a satellite crosses behind a power line from the dish’s perspective, it causes a brief signal interruption — fractions of a second, but enough to spike latency and interrupt video calls. Because it happens on a predictable cycle (same satellite arc, same power line, same interval), the app logs it as a regular obstruction. Power lines typically show as a thin red line on the obstruction map rather than a solid red patch — if you see a thin arc, look for a pole or wire in that compass direction from the dish.
This is a hardware issue that produces identical symptoms to a physical sky obstruction — intermittent drops, obstruction warnings in the app, variable performance. The Starlink cable carries both power and signal through a single proprietary connector. If the connector isn’t fully seated (a click confirms it), if the cable has a sharp bend near the wall entry point or cable guard, or if animal activity has nicked the outer jacket, signal integrity drops. The dish detects the degraded signal as missed satellite contact and logs it the same way it would log a tree branch in the way. Inspect the cable from the dish all the way to the router. Look for kinks, sharp 90-degree bends, any visible outer jacket damage, and confirm both connectors click in fully. A replacement cable resolves this definitively.
The Starlink dish doesn’t know you moved it. It continues displaying the obstruction map from wherever it was last installed. If you recently relocated the dish, or if you’re an RV user who just arrived at a new site, the red arcs you’re seeing may be completely irrelevant — they reflect obstructions at the previous parking spot or installation address. The dish takes about one week to build a fully accurate new map for its current location. Clear the map manually to get a fresh read: Starlink app → Visibility → Obstructions → gear icon → Clear Obstruction Map. Until the map rebuilds, trust the actual connection performance more than the visual map display.
The Starlink dish self-aligns when it powers on, tilting and rotating to its optimal position for your latitude. If the mount hardware loosens over time — a common issue with pole clamps in freeze-thaw climates, roof mounts on tile roofs, or any mount that wasn’t tightened fully on installation — the dish can physically rotate or tilt after alignment. It’s now pointing slightly differently than it was when it learned its environment, and objects it previously aimed away from are now in frame. Check that every bolt, clamp, and bracket on the mount is tight, and that the dish hasn’t visibly rotated from its installed position. After retightening, stow and unstow the dish via the Starlink app to trigger a fresh self-alignment.
Starlink uses Ku-band frequencies (10.7–12.7 GHz) for its user downlink. Water in any form — specifically heavy rain at rates above roughly 25mm per hour — absorbs and scatters microwave signals at these frequencies. This is called rain fade and it’s a fundamental physics constraint, not a flaw in the dish or your installation. In severe storms, the app may log obstruction-like events even with a completely clear and unobstructed dish. Light rain, fog, and ordinary cloud cover have essentially no measurable effect on Ku-band at Starlink’s link budget. If the problem only appears during heavy storms and clears immediately after, rain fade is the cause and there is nothing to fix — it is a temporary, weather-related limitation shared by all satellite internet services.
The app says “obstructed” for several different reasons. This table maps what you’re seeing to what is likely causing it.
| What You’re Seeing | Likely Cause | Sky Actually Clear? | Fix Category | Urgency |
|---|---|---|---|---|
| Obstruction warning, sky looks open | Tree tops / chimney in low arc | Partially — low horizon | Physical — raise or relocate dish | Medium |
| Red arcs on map after moving dish | Stale obstruction map data | Yes — map is outdated | App — clear obstruction map | Easy fix first |
| Regular drops every few minutes | Power line / pole in satellite arc | Mostly — thin obstruction | Physical — relocate dish | Medium |
| Random drops, no pattern | Loose or damaged cable | Yes — not a sky issue | Hardware — inspect/replace cable | Check first |
| Blank band on obstruction map | Geostationary exclusion zone | Yes — this is normal | None — not an error | No action needed |
| Drops only during heavy rain | Rain fade (Ku-band physics) | Yes — weather issue | None — wait out storm | Temporary |
| Worse in summer than winter | Leaf canopy on nearby trees | Seasonal change | Physical — trim trees or raise dish | Seasonal |
| Obstruction appeared after no changes | Dish shifted on loose mount | Yes — alignment issue | Hardware — tighten mount, realign | Check next |
Work through these in order. The first three cost nothing and resolve the problem for a meaningful portion of users before they ever look at the sky more carefully.
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Check if the geostationary exclusion zone is causing confusion Open the Starlink app and look at the obstruction map. There is always a thick clear band across the map — this is the geostationary exclusion zone, and it is completely normal. Starlink’s own Help Center confirms this is not a problem. If this is what you’ve been looking at, there is nothing to fix and your service should be working normally.
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Clear the obstruction map if you recently moved the dish In the Starlink app, go to Visibility → Obstructions. Tap the gear or settings icon and select Clear Obstruction Map. This forces a fresh rebuild. The dish will take a few hours to a few days to populate accurate data for the current location. This is the right first move for RV users, anyone who recently relocated the dish, or anyone whose map seems to show obstructions in directions they know are open.
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Inspect the dish cable — full run, both connectors Walk from the dish down to the router and look at every inch of the cable. Check for sharp bends (especially where it passes through a wall or over a roof edge), kinks, pinched sections, outer jacket damage, or signs of animal chewing. At both ends, disconnect and firmly reseat the connector — you should hear or feel a click. A cable that feels plugged in but isn’t fully seated causes intermittent drops identical to an obstruction. Replace the cable if any damage is visible.
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Physically inspect the mount — tighten everything Check every bolt, clamp, and bracket in your dish mount. A dish that has rotated or tilted from its original position will show unexpected obstructions because its sky view has shifted. Tighten all hardware and note if the dish has visibly moved from its original installed angle. After retightening, stow the dish via the app (Settings → Stow), wait 30 seconds, then unstow it. This triggers a fresh self-alignment.
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Use the obstruction checker at dish height — not standing height Open the Starlink app and tap Check for Obstructions. Go to the exact mount point — stand on a ladder if the dish is on the roof, or hold your phone at the same height as the dish. Pan slowly in a full circle. The app uses your camera and sensors to show you which parts of the sky cone are clipped. Look for red areas in the direction the app flags. A quick walk around from dish height will reveal chimneys, vent pipes, rooflines, and tree tops you couldn’t see from the ground.
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Look for near-horizon obstructions in the direction the app flags If the app’s map shows red in a specific compass direction — say, northwest — go to that side of the dish and look at the horizon from the dish’s perspective. You’re looking for anything that intrudes above 25 degrees above that horizon: tree tops, neighboring rooftops, a barn or garage edge, a utility pole. Most people’s first visual sweep misses these because they’re looking up, not outward at 25 degrees from horizontal.
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Raise the dish if possible — height is the single most effective fix Moving the dish higher is the most reliable solution for obstructions that can’t be removed (neighboring buildings, terrain, trees you don’t own). Going from ground-level to a roof mount, or from a low eave mount to a roof peak, dramatically flattens the apparent angle of obstructions. A dish at roof peak height often sees completely clear sky in all directions while the same dish at eave height was clipped by every tree in the yard. Starlink sells pole mounts, roof mounts, and pivot mounts — the right choice depends on your roof type and access.
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Reboot the dish and router if the obstruction warning is new and sudden If the obstruction warning appeared suddenly after a period of normal operation and nothing physically changed, a software hang or failed firmware update can occasionally cause false readings. Unplug the router from power, wait a full 60 seconds, then plug it back in. This clears cached state and forces a fresh satellite acquisition. In the app, go to Settings → Reboot Starlink if you want to reboot only the dish without cycling the router. This won’t fix a real physical obstruction, but it costs nothing and takes two minutes.
The Starlink app’s obstruction view is more useful than most people realize — but only if you know what the colors and numbers actually represent.
Solid red patches on the obstruction map represent hard, opaque obstructions — buildings, chimneys, rooflines, solid terrain features like hills or rock faces. These block the signal completely when a satellite passes behind them. There is no partial signal to work with; the connection drops and waits for the next available satellite. The direction the red patch appears on the map directly corresponds to the compass direction from your dish — red in the northeast means something solid is blocking the northeast sky arc. The fix is always physical: raise the dish above the obstruction, move the dish to change the sight line, or — only if you own and have access to it — remove the obstruction.
Orange or less saturated patches represent soft obstructions — trees, branches, foliage, wire mesh, and similar partially transparent objects. The signal passes through these with degraded quality rather than being completely blocked. The dish detects degraded satellite passes and logs the zone as a soft obstruction. Soft obstructions cause inconsistent performance rather than clean dropouts: you might notice slower speeds, increased latency, or occasional drops rather than predictable connection loss. A soft obstruction in a high-traffic part of the satellite arc is more disruptive than a hard obstruction in a rarely-used arc, which is why the percentage alone doesn’t tell you the full story.
The thick clear band you see on the obstruction map — the part that looks like nothing is there — is the geostationary exclusion zone. Starlink intentionally avoids using the arc of sky directly above the equator (appearing as roughly a southern band for most U.S. users) to prevent interference with geostationary satellites permanently parked in that zone. This will always appear blank regardless of your installation. It is not a problem, not an obstruction, and not something to try to fix. Starlink’s own Help Center explicitly confirms this is normal and expected behavior in every installation.
The app reports obstructions as a percentage of the required sky cone that is blocked. Under 15% is effectively fine for most users — performance is essentially unaffected. Between 15% and 30%, expect occasional brief dropouts, particularly during video calls or gaming. Above 30%, speeds degrade noticeably and the connection becomes unreliable for sustained use. But the percentage alone doesn’t tell you everything — a 3% obstruction in the most frequently traveled satellite corridor causes more real-world disruption than a 10% obstruction in a direction satellites rarely pass through. Check the Statistics → Outages section in the app to see how many actual interruptions are occurring, not just the theoretical percentage.
This is the most common version of this problem for mobile users. The obstruction map is built at each location over time — when you move, you bring the old map with you. Clear it manually: Starlink app → Visibility → Obstructions → gear icon → Clear Obstruction Map. Then give the dish several hours to a few days at the new site to rebuild accurate data. While waiting for the map to update, judge your connection by actual performance (speed and dropout frequency) rather than by the visual map. A second common issue for RV users: the dish may be placed very close to the RV itself, and the vehicle’s roof or walls are clipping part of the sky arc. Move the dish at least 2–3 feet away from the RV body and check from that new position using the app’s obstruction checker.
Seasonal obstructions from deciduous trees are one of the most reliably confusing Starlink problems because the installation seemed fine and nothing has “changed.” But the trees leafed out. Wet leaves at Ku-band frequencies (10.7–12.7 GHz) attenuate the signal meaningfully — a tree that caused no issues in February with bare branches may have 40% more effective blockage in June with a full canopy. Check the obstruction map now (summer) versus a screenshot from winter if you have one, and look for new soft obstruction patches in the directions where your trees are. The fix is either raising the dish above the canopy, trimming the offending branches, or relocating to a clearer spot. None of these is as dramatic as it sounds — often adding 4–6 feet of height with a taller pole mount clears the canopy entirely.
If the app is showing an obstruction warning but your actual download and upload speeds are reasonable and you’re not experiencing frequent dropouts, the obstruction may be in a low-traffic portion of the satellite arc. Not all sky blockage affects your connection equally — the dish has more satellite paths available than it needs at most moments, and a partial obstruction in one direction may be routinely worked around by beam-switching to satellites in a different direction. Check the Outages section in Statistics: if there are fewer than a minute or two of actual outage per day, the practical impact on your service is likely minimal. You can monitor it without taking immediate action, but check the map direction and investigate if the number of outage minutes climbs over time (which can happen as trees grow).
A new installation warning almost always means one of two things: the dish’s sky view genuinely has an obstruction the pre-install scan missed, or the map is still building data and early readings are inaccurate. First, use the Starlink app’s Check for Obstructions tool from the exact dish mount location — hold the phone at the same height as the dish, not at standing height. Scan slowly all the way around. If the scan shows red in a specific direction, that’s your real obstruction and a physical fix is needed. If the scan shows a clean sky, leave the dish running for 24–48 hours and check the map again — early maps are less accurate than maps built over several days of satellite pass data.
True physical obstructions cause drops on a predictable cycle because satellites follow consistent orbital paths — the same spot in the sky gets blocked on the same time interval, producing a rhythm. If your drops have no pattern — sometimes every few minutes, sometimes everything is fine for an hour, sometimes it drops right in the middle of a sentence on a video call — that’s more consistent with a cable or connector issue than a sky obstruction. Unplug both ends of the dish cable, inspect for damage, and firmly reseat both connectors until they click. Swap the cable with a spare if you have one. Also check that the router is ventilated — an overheating router produces random dropout symptoms that look identical to a connectivity problem with the dish.
This guide is for informational purposes only. Starlink product features, app interfaces, and support procedures change with firmware and software updates — verify current steps in the Starlink app or at starlink.com/support. Hardware inspection and mount work should be performed safely; working at roof height carries fall risk and should be done with appropriate safety equipment or by a qualified installer. This content is entirely original.