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Related to directional antenna: omnidirectional antenna
directional antenna[də′rek·shən·əl an′ten·ə]
An antenna that radiates or receives radio waves more effectively in some directions than others.
An antenna or aerial that radiates and receives signals mainly from one direction. For terrestrial radio communications, directionality in an azimuth or a horizontal plane is important. Directional antennae are either monodirectional, bidirectional, or omnidirectional (i.e., their maximum gain is either in one or two opposing directions or in all directions in one plane). Sophisticated directional antennae provide a large gain in their favored direction. A group of antennae arranged for this purpose is called an antenna array.