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“Elevated counterpoises using pairs of horizontal wires behave much differently”
So in Carl’s case, where his I-beam-air duct-random wire counterpoise is not buried or in close proximity to the earth as it is within his home, his grounding system would significantly add to the radiated field strength as would an AC ground system “because the lengths of those wires are not excluded by ¶15.219(b) if they are oriented in the horizontal plane” or any other plane for that matter far enough above ground.
However, his uphill ground wire and other such wires near or in earth contribute little if any to the measureable far field but serve to improve the far field by reducing ground loss.
So where as both situations result in improved far field signal, one method is and the other method is not OK.
Also interesting to note is the fact that these gound currents which are so feverishly sought after with elaborate ground rod systems, sea salts, etc. are not even required when “A monopole driven against an elevated counterpoise needs/uses no currents collected from the earth around the monopole, in order for it to be a very efficient antenna system.”