How the Radio Spectrum Works

You've probably heard about "AM radio" and "FM radio," "VHF" and "UHF" television, "citizens band radio," "short wave radio" and so on. Have you ever wondered what all of those different names really mean? What's the difference between them?

A radio wave is an electromagnetic wave propagated by an antenna. Radio waves have different frequencies, and by tuning a radio receiver to a specific… » Full Story on HowStuffWorks