In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking, and satellite communication, among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter. Radio is widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing, and other applications. They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). Radio is the technology of signaling and communicating using radio waves. A variety of radio antennas on Sandia Peak near Albuquerque, New Mexico, US
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