Main Page | See live article | Alphabetical index The High Gain Antenna (HGA) is an antenna with a focused, narrow radiowave beam width. This narrow beam width allows for more precise targeting of where you want the radio signal to go - also known as a directional antenna. Most commonly referred to during space missions, these antennas are also in use all over Earth, most successfully in flat, open areas where no mountains lie to disrupt radiowaves. See also: Low Gain Antenna This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.