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Indoor antennas are designed to be located on top of or next to the television set, but are ideally placed near a window in a room and as high up as possible for the best reception. [1] The most common types of indoor antennas are the dipole [2] ("rabbit ears"), which work best for VHF channels, and loop antennas, which work best for UHF. [3]
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 ...
The receiving antenna height of 10m dates from the 1950s when receivers were relatively insensitive and used rooftop antennas. Although this may seem unrealistic for typical situations today, when combined with the above threshold it is considered a good proxy for providing coverage to more sensitive modern receivers used without external ...
VHF is the first band at which wavelengths are small enough that efficient transmitting antennas are short enough to mount on vehicles and handheld devices, a quarter wave whip antenna at VHF frequencies is 25 cm to 2.5 meter (10 inches to 8 feet) long.
Rebuilt in 2003, the new tower has almost the same height, i.e. 326.8 m (307.1 m for the structure, but the antenna is shorter (19.7 m)). Angara transmitter, Northern Mast, Angara, Russia June 6, 2001: Guyed steel lattice mast carrying a T-antenna 205 Deteriorated support guys World Trade Center North Tower, New York City, NY September 11, 2001
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Panel antennas are common at Ultra high frequencies or UHF, where they are often used for cellular/mobile base stations or wireless networking due to their size and directional properties. At very high frequencies, such an antenna would be impractically large for most receiving applications unless implemented as no more than a two-bay design.
The typical height of a 'T' antenna is shorter than the quarter wavelength required for resonance. A 'T' antenna is distinguished from the similar 'L' antenna by the place where the dangling, radiating wire attaches to the horizontal cross wire: For the 'T' antenna the dangling wire attaches to the exact center of the top horizontal wire.