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Height above average terrain (HAAT), or (less popularly) effective height above average terrain (EHAAT), is the vertical position of an antenna site above the surrounding landscape. HAAT is used extensively in FM radio and television , as it is more important than effective radiated power (ERP) in determining the range of broadcasts ( VHF and ...
A mast radiator or mast antenna is a radio tower or mast in which the whole structure is an antenna. Mast antennas are the transmitting antennas typical for long or medium wave broadcasting. Structurally, the only difference is that some mast radiators require the mast base to be insulated from the ground.
In telecommunications, the effective height of an antenna is the height of the antenna's center of radiation above the ground. In low- frequency applications involving loaded or nonloaded vertical antennas, the effective height is the moment of the current distribution in the vertical section, divided by the input current.
Pinnacle Towers Mount Selman: Mount Selman, Texas: Guyed Mast 446.8 m KMSP TV Tower: Shoreview, Minnesota: Guyed Mast 446.7 m Media General Operations Tower Youngstown: Mount Selman, Texas: Guyed Mast 446.5 m KLKN TV-Tower: Utica, Nebraska: Guyed Mast 446 m WCES TV Tower: Wrens, Georgia: Guyed Mast 445.9 m New World Communications Tower ...
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
The horizontal gain continues to increase up to a maximum of about 6.6 dBi at a length of five-eighths wavelength 5 / 8 λ so this is a popular length for ground wave antennas and terrestrial communication antennas, for frequencies where a larger antenna size is feasible. The input impedance drops to about 40 Ohms at that length.
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