Total posts : 45366
Radial systems on a roof are no different from a radial system in the ground or laid on the surface of the ground. Difference is that for lightning protection, you need to run a ground line from your elevated system to Earth ground and into a ground rod. This can be done through a plumbing vent pipe which would probably be better as that vent pipe would be surrounded by the structure material and may provide some attenuation to any emitted signal from the vent pipe. Adding a choke between the vent pipe and the ground radial system will further reduce any chance of the vent pipe from radiating. Without it, it might produce an excessive field strength even with the vent pipe being surrounded by building material.
RFB
