The key word is "advertised." The height above ground is the principal
determinant of take-off angle, for any horizontal antenna from a dipole
on up. On the other hand, if your house were at the top of a fairly
steep hill, then your take-off angle could be radically lower. I very
much doubt that you could notice a difference among these antennas in
real life.
73, Pete N4ZR
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On 9/22/2009 10:52 AM, John Geiger wrote:
> I have been looking at getting a 2 element tribander up on the roof tripod,
> so its height will be about 25 feet or so above ground. The 2 elements ones
> I have seen on the market with a manageable boom length (6 feet or so) for me
> include the Mosley TA32jr, Mini 32, and Mini 33, the Cushcraft MA5B, and the
> Hy-Gain TH2. In looking at the specs of these antennas there seems to be
> some real differences in the advertised gain, in the order or 2 or more DB
> difference on some bands. Has anyone modeled these antennas at a low height
> (or used one at a low height) and could comment on their performance or
> modeled gain?
>
> 73s John AA5JG
>
>
>
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>
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