radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge

the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television

a former name for a radio wave; an electromagnetic wave of radio frequency generated by oscillations in an electric circuit

a radio wave that is reflected back to earth by the ionosphere or a communications satellite; permits transmission around the curve of the earth's surface

a radio wave propagated on or near the earth's surface

a radio wave used to transmit and receive messages

a radio wave that can be modulated in order to transmit a signal

the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television