![]() By contrast, a low-gain antenna ( LGA) is an omnidirectional antenna with a broad radiowave beam width, that allows the signal to propagate reasonably well even in mountainous regions and is thus more reliable regardless of terrain. Most commonly referred to during space missions, these antennas are also in use all over Earth, most successfully in flat, open areas where there are no mountains to disrupt radiowaves. A high-gain antenna ( HGA) is a directional antenna with a focused, narrow beam width, permitting more precise targeting of the radio signals. The extent to which an antenna's angular distribution of radiated power, its radiation pattern, is concentrated in one direction is measured by a parameter called antenna gain. This contrasts with omnidirectional antennas such as dipole antennas which radiate radio waves over a wide angle, or receive from a wide angle. This can increase the power transmitted to receivers in that direction, or reduce interference from unwanted sources. ![]() Directional antennas can radiate radio waves in beams, when greater concentration of radiation in a certain direction is desired, or in receiving antennas receive radio waves from one specific direction only. A directional antenna or beam antenna is an antenna which radiates or receives greater radio wave power in specific directions.
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