300 to 1,000 ft: a wireless bridge to the barn

Reach

Miles with a clear view

Main part

Bridge pair, $108–$139.99

Digging

None

Needs

Line of sight, power at both ends

First: can they see each other?

This decides everything. Stand where the house radio would go and look for the barn spot. Binoculars help. If you can’t get up high, tape a phone to a pole and record a video. Leaves count as blocked: 5 GHz signals lose a lot of strength going through trees, and summer leaves are worse than bare winter branches.

• Clear: follow this recipe.
• Blocked, but a spot sees both ends (a pole, a shed roof, a rise): use a relay hop.
• Blocked everywhere: fiber if you can dig, or an LTE camera if it’s just a camera.

How much clearance you need

Radio signals travel in a fat oval between the antennas, not a thin line. Keep at least 60% of that oval (the first Fresnel zone) clear. It’s widest at the midpoint:

Worked from the standard formula: radius (ft) = 36.03 × √(distance in miles ÷ frequency in GHz). Radios on the 2.4 GHz band need a wider zone.

Steps

1. Set the pair up on a table first. Power both, update firmware, set one as the access point and one as the station, and confirm they link. Many pairs come pre-paired.
2. Mount the house radio high on a solid mast or the gable end, pointed at the barn. Run outdoor Cat6 down to the PoE injector inside.
3. Mount the barn radio the same way, pointed back.
4. Aim. Use the radio’s signal meter or app. Move it a few degrees at a time and stop at the strongest signal. Tighten everything.
5. Fit a surge protector on the cable from each radio, inside, grounded. Bond each mast to the building’s grounding system.
6. Plug in. House PoE injector’s LAN side to a router LAN port; barn side to a switch, access point or camera.
7. Check it in summer. If you set it up with bare trees, look again when leaves are out.

Parts for a 500 ft link

Past 1,000 ft, the planner switches to the long-range class ($142–$218 a pair): higher-gain dish antennas that hold a link farther. 60 GHz radios are faster but even rain can weaken them, so they need a 5 GHz backup.

What happens after

Check the radio app now and then for signal strength. A sudden drop usually means growth in the path, a mast that moved in the wind, or ice. Update firmware once or twice a year.

Common reasons it fails

• No real line of sight, or leaves grew in. Fix.
• Mounted too low, so the ground or a roof cuts into the Fresnel zone.
• No power or a loose PoE connection at the far end.
• Surge damage to an ungrounded radio. Fix.