A couple of thoughts based on hard-learned experience: 1) Radios do have a relatively short life, even with proper carrier grade STP cabling and surge protecto

A couple of thoughts based on hard-learned experience: 1) Radios do have a relatively short life, even with proper carrier grade STP cabling and surge protectors. ESD damage from t-storms will inevitably take its toll on them. Usually though, either you can get them replaced under warranty, or at least get a better/faster replacement (although you have to upgrade both ends). 2) It's not a good idea to run any kind of wires between buildings that have separate electrical systems / different ground potential (an outbuilding with a sub panel is fine). I've seen differences in ground potential of 12-15V or more measured between the drain/ground wire and the building ground (this can also varies daily based on the moisture levels around the buildings). Ethernet does use differential signaling, so it's "mostly ok" if you're under 100m. But again the bigger issue is that ESD from t-storms will cause damage to switches (even STP cable grounded at one end) with long runs of ethernet. YMMV with a metal conduit, or with proper surge protection where the cable enters the building. You'll also need (expensive!) carrier grade shielded twisted pair with the drain wire and UV resistant if it's in the sun as well as shielded ethernet jacks for each end (well, you should probably only ground one end). 3) TBH, Fiber is where it's for building to building if you can do it. Most decent switches these days have one or more SFP ports and you can get a pair of Gigibit SFP transceivers for ~$15. Multimode fiber is pretty cheap too -- you can get custom lengths, armored etc. the hard part is the trenching/conduit! But if you're going to go to the trouble of digging a trench and running conduit then put fiber in it, don't bother with ethernet!