Usually not well, and Starlink doesn’t support it. A dish behind a window loses most of its view of the sky to the walls and roof around the window. Many modern windows also have Low-E coatings that block almost all of the signal. Plain single-pane glass lets more through, so a window setup sometimes works for a while, but expect dropouts. Mount the dish outside if you can.
Key Takeaways
- Starlink says the dish needs a clear view of the sky from about 20° above the horizon, all the way around, and must be 100% unobstructed for best performance
- A window only shows the dish a slice of that sky, so the connection drops whenever satellites pass out of view
- Low-E (energy-saving) glass measured over 30 dB of loss in tests either side of Starlink’s frequencies, which is more than 99.9% of the signal
- The app’s camera obstruction check sees through glass, so it can’t tell you how much signal the window blocks
- An outdoor mount (roof, wall, pole or even a kickstand in the yard) is the reliable fix
Why a Clear Signal Path is Crucial for Starlink
Starlink’s satellites move across the sky constantly, so the dish keeps switching between them. Starlink says each dish should have a clear view of the sky from around 20° above the horizon with a full 360° of rotation, and that it “must be 100% unobstructed for best performance”. Its install guidance also says not to install next to a wall or other structure, or under a covered outdoor area (Starlink: Prepare for install).
Put a dish inside a room and the window is the only opening; the wall, ceiling and roof block the rest. Even if the glass were perfectly clear to radio, most of the sky would still be hidden.
The Science of Signal Obstruction: Why Glass is a Problem
How Starlink’s Radio Frequencies Interact with Materials
Starlink dishes talk to satellites in the Ku band: about 10.7–12.7 GHz down and 14.0–14.5 GHz up, according to SpaceX’s FCC filings (FCC filing). At these frequencies, signals are easily weakened by materials that barely affect cellphone or WiFi signals, especially anything metallic.
The Culprits in Glass Composition
Low-E (energy-saving) coatings. These are the biggest problem. Low-E glass has a microscopically thin metal-oxide layer that reflects heat, and it reflects radio waves too. Researchers at NYU WIRELESS measured a low-E glass wall at 33.7 dB of loss at 6.75 GHz and 42.3 dB at 16.95 GHz (Shakya et al., 2024). Starlink’s frequencies sit between those two. A 30 dB loss means more than 99.9% of the signal power is gone.
Double and triple glazing. Most modern double- and triple-glazed units include a Low-E layer, and every extra pane adds some loss of its own.
Window film and tint. Metallized films work like a Low-E coating. Non-metallic (dyed or ceramic) films are generally less of a problem, but check the product before assuming.
Car windshields. Some windshields have heat-reflecting metallic layers, and the roof pillars block much of the view anyway. A Mini on the dashboard faces the same limits as a dish behind a house window.
“It Works for Me!” – Anecdotal Success and the Variables at Play
Why Some Window Setups Work (For a While)
You will find owners online who say a window setup works. That is plausible in the right conditions: an old single-pane window without coatings, a big window facing open sky, and a dish pressed close to the glass. What they usually report next is short, regular dropouts. As satellites move out of the small patch of sky the window shows, the dish loses them until the next one comes into view.
Key Factors for Success
- Type of glass: plain single-pane glass without Low-E coatings, tints or films gives the best chance.
- How much sky the window shows: a large window, skylight or glass roof high up beats a small window at ground level.
- Distance from the glass: keep the dish close to the glass so the window takes up as much of its view as possible.
- Short-term use: a window setup is more tolerable for a few days than as your home connection.
| Related: Optimal Starlink Dish Placement: Finding the Perfect Direction
Testing Your Window: How to Know if It Will Work
Using the Starlink App’s Obstruction Checker
The app’s “Check for Obstructions” tool uses your phone’s camera to map trees and buildings in the dish’s view. It sees through glass, so it won’t show how much signal a coated window blocks. Once the dish has been running for a while, the app’s live obstruction map, built from the dish’s own signal, is the better guide.
The Comprehensive Window Test
- Set the dish up temporarily as close to the window as you can.
- Let it run for several hours, so the live obstruction map in the app fills in.
- Check the Statistics and Outages views for regular short drops.
- Compare with the same dish outside, running a speed test in each position.
- Decide on the worst hour, not the best one. Evening congestion and rain on the glass make a marginal setup worse.
The Best Solution: Proper Mounting for Optimal Performance
Why Outdoor Mount Installation is Superior
Starlink says many customers find a permanent mount in an elevated spot, like a roof, pole or wall, gives the best service (Starlink: Where should I install my Starlink?). The dish is built to live outside; its weather ratings are covered in is Starlink waterproof.
Overview of Recommended Mounting Options
- Roof mounts: get the dish above most nearby obstructions; the usual choice for homes.
- Wall mounts: an alternative where roof access is difficult; long versions clear eaves and gutters.
- Pole and pipe mounts: attach to an existing mast or a new pole; see our Starlink pole mount guide.
- Non-penetrating mounts: weighted bases for flat roofs or rentals where you can’t drill.
- For the Mini: clamp, pole and magnetic mounts; see our Starlink Mini mounts guide.
Creative Solutions and Workarounds
Window-Mounted Suction Cup Options
Suction-cup window mounts exist, mostly for the Mini, but they don’t change the physics. Treat them as a stopgap for a short stay.
Custom Enclosures and Radomes
Starlink strongly recommends against adding covers over the dish, because they degrade performance and snow melt (Starlink Help Center). The dish is already weatherproof, so an enclosure adds risk without a benefit.
Run the Cable, Not the Dish, Through the Window
If the problem is getting a cable outside, flat window-pass-through cables and cable routing kits let you keep the dish outdoors and the router inside without drilling.
Real-World Performance Considerations
Weather Impact on Glass Installations
Rain, condensation and frost on the glass add more loss to a setup that is already marginal.
Network Congestion and Signal Margins
A weak signal leaves less headroom when the network is busy in the evening, so a window setup that feels fine at night can struggle at peak times.
Starlink Mini Considerations
The Mini is small enough to prop in a window, but it needs the same view of the sky as the Standard dish, and its smaller antenna has less signal to spare.
Troubleshooting Common Issues
When Glass Setups Partially Work
- Regular short connection drops
- Lower speeds than the same dish outside
- Latency spikes
- Outages when it rains
Optimizing Marginal Connections
- Use the largest, highest window with the most open sky
- Avoid coated, tinted or filmed glass
- Keep the dish close to the glass
- Move the dish outside as soon as you can
| Related: Fixing Common Starlink Problems: Your Easy-to-Follow Guide
Frequently Asked Questions
Can Starlink work through a window?
Sometimes, poorly. The window shows the dish only part of the sky, so it drops out as satellites move, and coated glass can block almost all of the signal. Starlink recommends an unobstructed outdoor location.
Does Starlink work through glass?
Plain glass lets some of the signal through; Low-E, tinted and metal-filmed glass blocks most of it. Even with clear glass, the walls around the window are the bigger problem.
Can Starlink be used indoors?
The router and power supply belong indoors, but the dish doesn’t. It needs a clear view of the sky, and Starlink says not to install it next to a wall or under a covered area.
Does window tint block Starlink?
Metallized tint does, much like Low-E glass. Dyed and ceramic films are generally less of a problem, but they don’t fix the limited view through a window.
Will a Starlink Mini work through a car windshield?
Not reliably. The roof and pillars block much of the sky, and some windshields have metallic layers. Mount it on the roof instead; see Starlink for cars.
Will Starlink work under a skylight?
A large, uncoated skylight shows more sky than a wall window, so it can work better, but it still limits the view and most modern skylights have Low-E glass.
Conclusion: Don’t Let Glass Be Your Connection’s Bottleneck
Glass is only half the problem: the walls around a window hide most of the sky Starlink needs, and energy-saving glass blocks most of what’s left. A window can get you online in a pinch, but for a connection you can count on, put the dish outside and bring the cable in.
