Total posts : 45366
I will have to disagree about the tower, mast and grounding radials being a consideration in the part 15 antenna specifications. The rules specify ground “lead” and not the grounding system. As proof of that assumption take a look at the commercial and toy products certified by the FCC. Many of them include an alligator clip to connect to ground and the directions even suggest using a cold water pipe or electrical ground of the house or business. Clearly that would suggest that the transmitter designs were accepted with the knowledge that the ground lead would be connected to something much larger. Also I feel if that were a legitimate issue there would be restrictions as to what the ground lead of these transmitters could be connected to.
I think the rules specify a ground lead because in many cases measuring a ground system would be impractical. For instance, how would you measure a solid sheet ground (or metal roof) or a mesh? Comparing the radius of a mesh or solid ground to similar length radials would not be fair to those using radials as the combined length of the radials would be much longer than the radius of a mesh or solid, yet not have anywhere near the performance.
I believe that if the FCC was truly concerned about ground systems, they would have written rules that were precise and detailed. A ground lead connects to ground. It does’t say that the lead is the entire grouding system. Their biggest concern about part 15 would be interference to licensed stations. For those of us using legal power and being diligent in selecting a frequency, there’s no chance of that.