Fitted with a radio collar

A radio transmitter, fastened to a wild animal, (usually around the neck) so that the animal's movements may be tracked.

The systematic listening to, and reporting of, foreign radio transmissions in order to gather intelligence.

A wireless modem

The receiving of radio signals / The quality of the sound produced by a radio as a result of the strength of the signal, and the presence of interference

A tower or mast containing one or more antennas to transmit radio signals

(nautical) The person, on board ship, who sends and receives radio messages

A radio telescope that has two or more separated receiving antennas in order to measure angular distances as small as one second of arc

Either of a pair of intense beams of radio waves emitted by a microquasar or similar object

The continuous monitoring of the position and range of a remote object using radio