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radio range beacon

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noun
  1. a radio transmitter that utilizes two or more directional antennas and transmits signals differing with direction, permitting a flier receiving a signal to determine his or her approximate bearing from the transmitter without a radio compass.
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Origin of radio range beacon

First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018