Originally Posted by KRSW

Under an eve and reasonably weather-protected? Regular Cat 5/6 cable will do the job. Up on the peak of a roof or on a tower? Shielded is a good idea. The only shielded I'm using is on a radio tower with other uses.

Ubiquiti AirMax stuff by chance? They're well-known for doing this. Ubiquiti's "solution" of using shielded cable doesn't make a difference. A friend of mine has a Wireless ISP and we've tried multiple combinations. All of the older Ubiquiti stuff will eventually exhibit this problem. He's made his own home-build surge protectors which HAVE made a difference. But honestly, on top of my office building I'm using a Nanobeam M5 with regular white indoor Cat5E cable with one of his surge protectors. It's made it through numerous hurricanes and the Florida sun. Still connecting at full speed. This Nanobeam replaced an original Nanobeam which would drop down to 10Mbps and stay there until it was rebooted.