How To:
I followed this simple radio shack hack - bought a simple fm and am radio from Radio Shack, clipped a pin and that lets it scan through all stations with out stopping. Using this method you should not hear continuous words becase radio station stays for less than a second on each station.
This turns it into a Ghost Box.
All you do is then hook up the hacked box to speakers, and tape the sound with a mic. I used noise reduction to clear up some of the sound. Some voices you hear, others come out after you clean it up from static and grumble.
I use Adobe Soundbooth with the remove noise feature at about 80%
It's only myself and 2 cats in the place at the time, so no other people around to make these sounds.