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Re: [TowerTalk] HAAT calculator

Subject: Re: [TowerTalk] HAAT calculator
From: K4SAV <>
Date: Sat, 07 Jan 2006 20:43:00 -0600
List-post: <>
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

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