Streaming and Wi-Fi after wall-mounting

It's a common surprise: the TV streamed perfectly on its stand, and a week after going on the wall it buffers. Nothing is broken. The radio conditions around the TV changed.

Why mounting can hurt Wi-Fi

• The TV is its own shield. The Wi-Fi antenna is inside the chassis, usually low on the back. On a stand, signal reached it from all around. Flat against a wall, a large metal-backed panel sits between the antenna and the room.
• The wall matters. Brick, block, stone, tile on cement board, and foil-faced insulation all weaken signal. A fireplace chase is close to a worst case.
• The bracket is a steel plate right behind the antenna.
• A streaming stick behind the TV is sandwiched between screen and wall.
• The TV moved. A new wall may simply be further from the router.

Check before you change anything

Run the network test in the TV's settings, or note the signal strength it reports. Then compare with a phone held at the same spot. If the phone is fine and the TV isn't, it's the TV's position; if both are weak, it's coverage in that part of the house.

Fixes, cheapest first

1. Use the 5 GHz band up close, 2.4 GHz at a distance. 5 GHz is faster but fades through walls; 2.4 GHz reaches further.
2. Move the streaming stick out from behind the screen with its HDMI extension lead, so it peeks past the edge.
3. Move the router higher and into the open; avoid cabinets and the floor.
4. Switch to a streaming box with Ethernet if the TV's own Wi-Fi is weak — many smart-TV Wi-Fi radios are modest.
5. Add a mesh Wi-Fi node in the TV's room.
6. Go wired.

Wired is the real fix

An Ethernet cable to the TV or streaming box ends buffering for good. If cables are being run in the wall anyway, adding a network cable costs almost nothing extra at that moment.

• Cat6 is plenty.
• Many TVs have only a 100 Mbps Ethernet port, which still streams 4K comfortably and is more stable than marginal Wi-Fi.
• No cable route to the router? MoCA adapters send network over existing coax, and powerline adapters over house wiring; MoCA is usually the more dependable of the two.

Plan it at mounting time

When the wall is open or a cord cover is going up, think about: HDMI, power, network, and an antenna or cable coax if you use one. One extra low-voltage cable now saves a second job later. Our wire options are a cord cover at $39 or in-wall at $119.

Over-the-air antennas

A flat indoor antenna taped behind a wall-mounted TV has the same shielding problem. Place it on a window or high on an outside wall and run thin coax to the TV.

Bluetooth remotes and soundbars

The same shielding can make a remote or wireless subwoofer flaky. Re-pair them after mounting, and keep a wireless sub in the open rather than inside a cabinet.

It isn't the mount

Mounting doesn't damage the TV's Wi-Fi hardware. If a network test at the old location still passes, the fix is about position or cabling.