Directional Antenna
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A directional antenna or beam antenna is an antenna (electronics)|antenna which radiates greater power in one or more directions allowing for increased performance on transmit and receive and reduced Interference (communication)|interference from unwanted sources. Directional antennas like Yagi-Uda antennas provide increased performance over dipole antennas when a greater concentration of radiation in a certain direction is desired. All practical antennas are at least somewhat directional, although usually only the direction in the plane parallel to the earth is considered, and practical antennas can easily be omnidirectional antenna|omnidirectional in one plane. The most common types are the Yagi-Uda antenna, the log-periodic antenna, and the corner reflector, which are frequently combined and commercially sold as residential TV antennas. Cellular repeaters often make use of external directional antennas to give a far greater signal than can be obtained on a standard cell phone....
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