There was an article in QST magazine written by N6BV that addresses
these situations and there is companion software available on the ARRL
web site. It's called YTAD (yagi terrain analyzer). You use a
topagraphical map for your location to obtain elevation data which you
plug into the program along with your antenna height data. The
program calculates the effective elevation plots (in various azimuth
directions) for your set of circumstances. This should give you the
answers that your looking for. There are also some commercial software
programs available for terrain analysis.
73, Stew K3ND
---Jonathan Kaplan wrote:
>
>
> Hi all,
> Of course, I've read many,many threads about the optimum height of
> various antennae and towers, but I wonder how does one measure height
> if the ground underneath the tower falls away? If, for example, the
tower is
> sitting at the top of a ridge and the ground falls away starting ten
feet from
> the tower, is the height some composite of heights within a certain
radius
> or is height always measured from the base to the antenna? Conversely,
> if the tower is sitting on the side of a hill, is the measured
height a
> composite
> of measurements from the uphill and downhill sides?
>
> Any thoughts on this
>
> TNX es 73
>
> Jonathan KO6XS
>
>
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>
>
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