A radio direction finder (RDF) is a device for finding the direction, or bearing, to a radio source. The act of measuring the direction is known as radio direction finding or sometimes simply direction finding (DF). Using two or more measurements from different locations, the location of an unknown transmitter can be determined; alternately, using...
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http://en.wikipedia.org/wiki/Radio_direction_finder
radio receiver and directional antenna system used to determine the direction of the source of a signal. It most often refers to a device used to ... [1 related articles]
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http://www.britannica.com/eb/a-z/r/4
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