There are many, many more things to consider when dealing with microwaves. At the higher frequencies, coax and antennas reduce the actual signal that gets converted to the EM waves. Ideally, the antennas should be more along the lines of an emitter and a reflecting dish. This makes it highly directional. Taking this into account can solve some problems but as already explained, create some too. A quick and simple approach would be to use the power line adapters that take a WIFI signal and attach it to the AC power in a facility. Not a sure cure but would help those outlying areas to get adequate signals for good communication.