radio beam

beam ( def 12 ).

1920–25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
radio beam
Sometimes shortened to: beam a narrow beam of radio signals transmitted by a radio or radar beacon, radio telescope, or some other directional aerial, used for communications, navigation, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Ie, the radio beam goes out in a horizontal direction is the aerial is
  vertically orientated.
Directional radio beam transmitters are installed on the bridge and aimed
  toward the center of the channel.
Another type that was tried experimentally was the low-frequency radio beam.
There will be a plasma screen with a high tech radio beam that goes out to the
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