Almost every amateur is familiar with the 144-MHz (2-meter) amateur band. FM, SSB, and amateur-satellite communications are used rather extensively in this range throughout the United States and most of the world. As the 2-meter band filled with amateur activity, operations expanded to 220 MHz. As a number of FM repeaters became operational in this spectrum, activity once again expanded to include the 440-MHz(70-cm) amateur band. The 70-cm band is primarily used for FM, amateur fast-scan television, and OSCAR (Orbital Satellite Carrying Amateur Radio) amateur communications.
