Brian Gaff wrote:

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I think many of these are helically wound, and some have amps in them. I've
often wondered how they can be good over such a wide bandwidth myself as
theoretically any wound component should have a narrow bandwidth or be very
bad at picking much up at all.


** Helical winding makes a short whip antenna resonant and so resistive across most of the FM band. The bandwidth is somewhat narrower than a regular 1/4 wave and the output signal lower pretty much in proportion to the length ratio.

Long range performance on stereo FM would be impossible were it not for the use of high powered transmitters equipped high gain antennas.




..... Phil