"This simple hack turns your Raspberry Pi into a powerful FM transmitter! It has enough range to cover your home, DIY drive-in movie, a high school ball game, or even a bike parade (depending on the stragglers)."http://makezine.com/projects/make-38-cameras-and-av/raspberry-pirate-radio/Perhaps one of the more intriguing aspects of this is: "The Raspberry Pi’s broadcast frequency can range between
1Mhz and 250Mhz, which may interfere with government bands."