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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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2 news items

 
Radio World
Thu, 16 Oct 2014 11:11:15 -0700

The center of the argument is over whether he built-out the towers for the directional array. Cutforth certified they were built, but the bureau noted none of the five towers were complete and two special operating conditions on the permit hadn't been met.
 
SouthCoastToday.com
Sun, 28 Sep 2014 21:18:45 -0700

Fourteen 408-foot tubular steel towers were erected in a directional array, stretching over a distance of some 7,000 feet. The 300 kilowatts of power from a colossal pair of generators fed the spark signal into the towers, which generated a very low ...
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