Total posts : 45366
Yes, Rich did say the FCC position on top-hats and counterpoise is unknown.
But since top-hats and counterpoise are wire of “any” configuration AND attached to the antenna system AND add conductor length it would seem the FCC would not allow them since the total length of the antenna system would exceed 3 meters and Part 15.219 does not permit length in excess of 3 meters.
Therefore by default the FCC position on top-hats and elevated counterpoise logically would be to not allow either.
According to Rich, buried wires forming an RF ground system do not contribute to the far field regardless of their configuration. If the RF ground wires are above ground AND symetrical (read counterpoise) they do not contribute to the far field so one would think it is allowable, same for a top-hat.
The confusion revolves around the fact that top-hats and properly designed elevated counterpoise themselves do not radiate (just as buried wires) but they are still wires of “any” configuration attached to the antenna system. According to Rich, wires of “any” configuration attached to the antenna system which extend the total antenna system length beyond 3 meters are not allowed per Part 15.219.
For that matter, buried wires extend the antenna also and if anyone says “yeah, but they don’t radiate”, well neither do properly designed counterpoise or top-hats.
I’m out of ways to present this… Just deal with it if they knock on your door!