Height above average terrain

Height above average terrain (HAAT) (or less popularly, EHAAT, Effective Height Above Average Terrain) is a measure of how high an antenna site is 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 UHF in particular, as they are line of sight transmissions). For international coordination, it is officially measured in meters, even by the Federal Communications Commission in the United States, as Canada and Mexico (both of which use metric) have extensive border zones where international stations can be received on either side of the international boundaries. Stations that want to increase above a certain HAAT must reduce their power accordingly, based on the maximum distance their station class is allowed to cover (see list of broadcast station classes for more information on this).

Before metrification at the FCC, the procedure to figure HAAT was relatively simple: from the proposed or actual antenna site, either 12 or 16 radials were drawn, and points at 2, 4, 6, 8, and 10 miles (16 km) radius along each radial were used. The entire radial graph could be rotated to achieve the best effect for the station. The altitude of the antenna site, minus the average altitude of all the specified points, was the HAAT. This can create some unusual cases, particularly in mountainous regions—it is possible to have a negative number for HAAT (the transmitter would not be located underground, but rather in a valley, with hills on both sides taller than the transmitter itself, for example).

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The Times of India 13 Mar 2025

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The Economic Times 13 Mar 2025

The West Bengal government has imposed a ban on Holi celebrations at Sonajhuri Haat in ...

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'Damage to trees': West Bengal govt imposes ban on Holi celebrations in Santiniketan Sonajhuri Haat; fuming BJP warns of 'arrests'

The Times of India 13 Mar 2025

The West Bengal government has banned Holi celebrations at Sonajhuri Haat in Santiniketan's Birbhum district this year, citing concerns over potential damage to the area's greenery, an official said on Wednesday.

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Bengal government imposes ban on Holi celebrations in Santiniketan Sonajhuri Haat

The Times of India 12 Mar 2025

The West Bengal government has banned Holi celebrations at Sonajhuri Haat ...

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Bihar Budget: From Pink buses, Kanya Vivah Mandap to Mahila Haat, check list of announcements ...

India TV 03 Mar 2025

Bihar Budget 2025 ... ....

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'Kanya Vivah Mandaps', 'Mahila Haat' To Come Up In Bihar As Nitish Kumar's Budget Woos ...

News18 03 Mar 2025

In keeping with the government’s push for women’s empowerment, budget has proposed setting up of a ‘mahila haat’ (women’s marketplace) in Patna, besides “pink toilets” in all districts and “pink buses” in major cities ... .

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LG Attends Heritage Festival At Kashmir Haat

MENA FN 01 Mar 2025

(MENAFN - Kashmir Observer) Srinagar- Lieutenant Governor Manoj Sinha attended the Srinagar Heritage Festival 'Soan Meeraas' at Kashmir Haat on Saturday. In his address, the Lieutenant Governor ... .

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Patna Haat: Witness state’s rich arts and crafts under one roof

The Times of India 28 Feb 2025

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Former PM of Australia Anthony John Abbott visits NAFED Millet Experience Centre at Dilli Haat New Delhi (Ministry of Agriculture & Farmers Welfare of the Republic of India)

Public Technologies 28 Feb 2025

Former PM of Australia Anthony John Abbott visits NAFED Millet Experience Centre at Dilli Haat New Delhi.

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Latest News for: haat

'Damage to trees': West Bengal govt imposes ban on Holi celebrations in Santiniketan Sonajhuri Haat; ...

West Bengal Minister denies Holi ban at Sonajhuri Haat in Santinikentan, says 'it’s a ‘request ...

'Damage to trees': West Bengal govt imposes ban on Holi celebrations in Santiniketan Sonajhuri Haat; fuming BJP warns of 'arrests'

Bengal government imposes ban on Holi celebrations in Santiniketan Sonajhuri Haat

Bihar Budget: From Pink buses, Kanya Vivah Mandap to Mahila Haat, check list of announcements ...

'Kanya Vivah Mandaps', 'Mahila Haat' To Come Up In Bihar As Nitish Kumar's Budget Woos ...

LG Attends Heritage Festival At Kashmir Haat

Patna Haat: Witness state’s rich arts and crafts under one roof

Former PM of Australia Anthony John Abbott visits NAFED Millet Experience Centre at Dilli Haat New Delhi (Ministry of Agriculture & Farmers Welfare of the Republic of India)

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