[TowerTalk] Determine cost-effective tower height

Dick Dievendorff dieven at comcast.net
Wed Nov 30 17:25:50 PST 2011

I think HFTA is by Dean Straw, N6BV.  In any case, it's the program you want
for this.  Ward edited the new Antenna Book, and included Dean's programs.

Dick, K6KR

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Jim Lux
Sent: Wednesday, November 30, 2011 5:00 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Determine cost-effective tower height

On 11/30/11 4:47 PM, Andreas Hofmann wrote:
> Hi,
> I have decided I need a tower to get better antennas up in the air.
Thinking about the SteppIR DB 18, 40m 2 el, 20 and up 3el.  Now, my property
slopes pretty much in every direction by 5 degrees.  I need to determine a
proper tower height without breaking the bank.
> I was told I should run a computer program to figure a good height of the
yagi for my most important directions/DX locations.  In fact a friend of
mine did the same (on a similarly sloping property) and he found out that a
55 foot tower would be similar to a 120 foot tower on a flat ground.   Hence
he put up a 55 foot crank up mast and it is rocking.  He forgot the program
he used.
> So, what tool can I use to find the optimal (not maximal) height of a
tower that would work well here?
> Also, the tower would be setting on the side of the house with a metal
roof (roof about 15 feet high), not sure if this would matter...
> Thanks
> Andreas
> KU7T

HFTA by Ward Silver which comes with the ARRL Antenna Book is what you want.
You enter in the surrounding terrain (or extract it from DEM files, etc.)
and it calculates the pattern.

Only works for horizontally polarized antennas, by the way.

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