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I also have read that the bandwidth of an antenna is more narrow with a thin metal, be it a whip or a wire; wider with a thick pipe. The technical term for the resonant range of an antenna is the “Q.”
But how large a diameter does an AM medium wave antenna need to be for an easy bandpass of 10kHz or 15kHz?
Take an audio frequency response graph using a whip, and then using a large-diameter copper pipe…. compare the difference.