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## Re: [TowerTalk] HAAT calculator

 To: towertalk@contesting.com Re: [TowerTalk] HAAT calculator K4SAV Sat, 07 Jan 2006 20:43:00 -0600
 ```Just to illustrate N4ZR's comment, I fired up HFTA and created a fictious terrain, one that a very good local terrain near the antenna, but had a lot of high stuff in the distance. If you used the website for calculating HAAT of this terrain, it should give you -270 ft. Sounds bad, huh? I used a dipole at 14MHz and compared the response of this dipole to a dipole over flat ground. At an elevation angle of 6 degrees, the dipole over my special fictious terrain beat the dipole over flat ground by 12 dB. Jerry, K4SAV Pete Smith wrote: >For HF operation, HAAT is fundamentally irrelevant. Average terrain elevation >from 43KM to 16 KM is, at most, only a small part of the picture. The best >tool available for hams is HFTA (HF Terrain Analysis), which relates the >effects of local topography to the arrival angles of the desired signals. > >Line-of-sight frequencies are a different matter, of course. > >73, Pete N4ZR > > > _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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