Lots More Information Related HowStuffWorks Articles How Radio Scanners WorkHow Radio WorksHow Ham Radio WorksHow does an EPIRB distress radio work?How Bluetooth WorksDo Certain Radio Wave Frequencies Pose Health Risks?Why Do You Hear Some Radio Stations Better at Night Than in the Day?How Internet Radio WorksHow Satellite Radio Works More Great Links Spread Spectrum SceneNTIA: Office of Spectrum ManagementFCC Radio Spectrum Home PageAllocation of Radio Spectrum in the United States