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In broadcast engineering, directional array refers to an antenna array arranged such that the superposition of the electromagnetic waves produce a predictable electromagnetic field. By spacing 2 or more antenna elements apart, changing the length of the transmission line from the transmitter, varying the power output, and shifting the phase, radio broadcasters can "shape" the area of signal coverage.

Geographically close co-channel or adjacent channel stations employ directional arrays (or a single directional antenna) so that other broadcasters may utilize the same or adjacent frequency. In the United States, the Federal Communications Commission offers a first-come, first-served approach, meaning licenses granted on co-channel or adjacent channels must protect the service contour of the previously licensed facility, thus, a directional array may be used to "shape" the station around existing facilities.

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Directional_array — Please support Wikipedia.
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3 news items

Wall Street Journal
Wed, 27 Aug 2014 14:00:00 -0700

The company's patented Digital Super Directional Array (DSDATM), patented PureAudioTM and patented EchoStopTM far-field microphone technologies enhance a wide range of audio products to eliminate background noise and ensure the optimum ...
All Access Music Group
Wed, 27 Aug 2014 14:56:15 -0700

WHIPLASH RADIO, LLC has filed for a Silent STA for WYCL-A/NILES, OH due to damage to the station's directional array. WVRM, INC. has requested a Silent STA for WPDI/HAZLET, NJ due to technical problems with the station's programming source.
Linex Legal (press release) (registration)
Wed, 13 Aug 2014 14:00:00 -0700

If one perimeter fence surrounds more than one tower (such as in an AM broadcast directional array), ASR information for each tower must still be posted at the base of that tower, with information for all of them at the fence entry points. (Multiple ...

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