I recently did a bunch of recordings of an old Silvertone AM/FM radio as well as a shortwave radio I had lying around. I used a Sennheiser 416 on the shortwave as well as a feed from the headphone jack; on the Silvertone I used a U87. I recorded into ProTools at 96k through a George Massenburg mic pre. With both radios, my technique was to do slow and quick sweeps through the frequencies, and then find interesting bits of static/noise/whatever and record 30 or so seconds of them without touching the dial. If I happened to land on a station where I heard stuff I didn't have the rights to use, I just figured I'd edit that out. And then I'd go back on the dial and flip past the station quickly to get the blip of a station starting to come in without there being any recognizable information there. With the shortwave radio, I didn't have the long antenna connected; I don't think I was able to tune in any actual stations! Maybe I'll do it again with the antenna on and see how different it is.