If you haven't heard it, The Conet Project [http://www.archive.org/details/ird059] is a collection of the numbers stations recordings. Pretty neat and eerie.
Wilco's Poor Places uses a sample from track 4 of disc 1, which also gave the title to the album, Yankee Hotel Foxtrot.
These are really creepy and keep giving me the chills.
Going to pass these on to my friend so he can sample them into his music. Wow, these sound so transmundane.