medium for communication
the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television
electronic equipment consisting of a combination of a radio receiver and a record player
electronic equipment consisting of a combination of a radio receiver and a record player
not transparent to X-rays or other forms of radiation
an aircraft without a pilot that is operated by remote control
an electronic receiver that detects and demodulates and amplifies transmitted signals
a communication system based on broadcasting electromagnetic waves
transmit messages via radio waves
