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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 ...
Effective Radiated Power (ERP, calculated using transmitter power and antenna HAAT) Antenna Height Above Average Terrain (HAAT) Reference distance C: 100 kW (or higher for grandfathered stations) 300 to 600 m (984 to 1,969 ft) 91.8 km (57.0 mi) C0: 100 kW 300 to 450 m (984 to 1,476 ft) 83.4 km (51.8 mi) C1: up to 100 kW under 300 m (984 ft)
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 ...
approx. 75 meters visible above water surface 609.6 m: KCAU TV Tower: Sioux City, Iowa: Guyed Mast 609.6 m KATV Tower: Redfield, Arkansas: Guyed Mast collapsed on January 11, 2008 609.6 m WECT TV6 Tower: Colly Township, North Carolina: Guyed Mast demolished in 2012 609.6 m KOLR Tower: Fordland, Missouri
Retrieved from "https://en.wikipedia.org/w/index.php?title=Antenna_height_above_average_terrain&oldid=787196299https://en.wikipedia.org/w/index.php?title=Antenna_height
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.