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

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