I can recall receiving audio from a drive-in movie theater back in the
late '80's. The movie was Dragnet with Dan Akroyd. Called about a
dozen drive-in theaters within a 300 mile radius to see if they were
playing Dragnet. Never did find out where it was coming from.

But I bet if I had the TinyTenna Indoor Amplified Shortwave Antenna
back then, I could have put it into direction finding mode, and found
the exact location of that wireless system.

73, Bill - WA8MEA
http://qth.com/dwm