Total posts : 45366
1) When I mentioned the NEC requirements regarding mast grounding I was not referring to the FCC rules since, as you know, the two address separate issues. The NEC and my local code grounding requirements have nothing to do with whether the mast is for supporting either a transmit or receive antenna. They apply to both purposes hence the power of the transmitter is irrelevant. Therefore, the NEC grounding requirements, if adopted by local regulators, apply to part 15 antenna masts and lead in wires. Let’s not give the impression that part 15 operations are exempt from these requirements.
2) Impedance distribution. This approach to the functioning of very short ground radials is subject to the fact that if the radials are in close proximity to the earth there is capacitive coupling to the earth and current induced in the earth will partly pass through the radials. The earth is now part of the radial system and the “maximum reactance” point is not at the end of the radials. This, unlike the vertical radiator, is not a resonant system with essentially zero current at the end.
The reactance at the tip of an antenna as defined by the vector quotient V/I is high because the current is essentially zero. This is not the case for radials due to the coupling to the earth and the voltage at the radial ends would be much lower if measured with respect to ground as compared with the antenna voltage.
I am still pondering the origin of your “100-200 volt” numbers.