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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.
For transmissions in the shortwave range, there is little to be gained by raising the antenna more than a half to three quarters of a wavelength above ground level, and at lower frequencies and longer wavelengths, the height becomes infeasibly great (greater than 85 metres (279 ft)). Shortwave transmitters rarely use masts taller than about 100 ...
TV antenna manufacturers often rated their top-of-the-line "deep-fringe" antenna models with phrases like "100 miles VHF/60 miles UHF" if the antenna included UHF reception at all. (In the practice of electrical engineering, the frequency range in which an antenna is to be used is an important factor in its design.)
The Long Range – Anti Ship Missile (LRAShM) is a member of the family of hypersonic missiles being developed by the Defence Research and Development Organisation (DRDO) for the Indian Armed Forces. The anti-ship version, which can be fired from a shore-based transporter erector launcher (TEL), is the first variant that is undergoing ...
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A three-element Yagi–Uda antenna used for long-distance communication in the shortwave bands by an amateur radio station. The longer reflector element ( left ), the driven element ( centre ), and the shorter director ( right ) each have a so-called trap (parallel LC circuit ) inserted along their conductors on each side, allowing the antenna ...