Two airport Extremes on a vacant channel should do the trick.
The Express just doesn't have the distance. Don't even try.
Use your Mac to find out what other WiFi channels are already in use.
The AirRadar app can also speed up the process.
Picking channel 1, 6, or 11 instead of a 5ghz (channel 149) got me better distance with higher throughput.
Do not try to get by with 2,3,4,5,7,8,9, or 10 because they just overlap causing interference with the primary channels 1, 6, and 11.
If the channel you pick becomes inconsistent be wary of interference from 2.4ghz cordless phones in the area and pick a different primary channel.
The Express just doesn't have the distance. Don't even try.
Use your Mac to find out what other WiFi channels are already in use.
The AirRadar app can also speed up the process.
Picking channel 1, 6, or 11 instead of a 5ghz (channel 149) got me better distance with higher throughput.
Do not try to get by with 2,3,4,5,7,8,9, or 10 because they just overlap causing interference with the primary channels 1, 6, and 11.
If the channel you pick becomes inconsistent be wary of interference from 2.4ghz cordless phones in the area and pick a different primary channel.