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Outdoor antennas provide up to a 15 dB gain in signal strength and 15-20 dB greater rejection of ghost signals in analog TV. [6] Combined with a signal increase of 14 dB due to height and 11 dB due to lack of attenuating building walls, an outdoor antenna can result in a signal strength increase of up to 40 dB at the TV receiver. [6]
VHF television services from both BBC and ITV were discontinued in January 1985 as the 405-line TV system was switched off across the UK as a whole. Moel-y-Parc's UHF channel allocation made it a "Group B" transmitter, but with the roll-out of the UK's first digital TV services in 1998, a "Group W" wideband aerial was needed.
An outdoor aerial being used for Freeview transmissions. An aerial is required for viewing any broadcast television transmissions. For all transmissions indoor, loft-mounted, and external aerials are available. In regions of strong signal an indoor aerial may be adequate; in marginal areas a high-gain external aerial mounted high above the ...
Patch antenna gain pattern. A directional antenna or beam antenna is an antenna which radiates or receives greater radio wave power in specific directions. 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.
An antenna designer must take into account the application for the antenna when determining the gain. High-gain antennas have the advantage of longer range and better signal quality, but must be aimed carefully in a particular direction. Low-gain antennas have shorter range, but the orientation of the antenna is inconsequential.
High-gain antennas have the advantage of longer range and better signal quality, but must be aimed carefully at the other antenna. An example of a high-gain antenna is a parabolic dish such as a satellite television antenna. Low-gain antennas have shorter range, but the orientation of the antenna is relatively unimportant.
Corner reflector antennas have moderate gain of 10–15 dB, [2] high front-to-back ratio of 20–30 dB, and wide bandwidth. Corner reflector antennas are widely used for UHF television receiving antennas , point-to-point communication links and data links for wireless WANs , and amateur radio antennas on the 144, 420, and 1296 MHz bands. [ 2 ]
A beam waveguide antenna is a type of complicated Cassegrain antenna with a long radio wave path to allow the feed electronics to be located at ground level. It is used in very large steerable radio telescopes and satellite ground antennas, where the feed electronics are too complicated and bulky, or requires too much maintenance and alterations, to locate on the dish; for example those using ...