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What? Does the fence itself vibrate and reproduce the sound? Or do you need to complete the circuit using the fence as the detector?

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I'm not entirely sure what process is converting to sound, but the metal fence makes a great antenna and we are talking about 10's of feet from the antenna with 500 kW AM at 200 kHz going into it.

It could actually have been arcing:

https://www.youtube.com/watch?v=uo9nGzIzSPw

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