Byron,
You did not state if omnidirectional coverage was required; if not, you
might consider a heavy-duty Yagi or corner reflector tilted down toward
the desired coverage area. Another option is a Sinclair SRL-222 dual
dipole antenna set for elliptical pattern. I have one of these in
hilltop service on 2m, and the close-in valley coverage is far superior
to that obtained with a vertical fiberglass antenna.
73, Eric Lemmon WB6FLY
"Hellewell, Byron (Mission Systems)" wrote:
>
> Hi
> I am doing some planning for an VHF repeater on the top of a
> 9000 foot high mountain top.
> The coverage is to the valley floor about 4000 feet below the repeater site.
>
> To get good valley coverage I have been contemplating using a
> 1/4 or 5/8 wave antenna mounted upside down.
>
> I am looking for suggestions from those who have had experience with upside
> down antennas.
>
> I know about the radome sealing problems and lightning protection.
>
> The antenna will also be subject to high winds and ice loading.
>
> Wondered about shadowing of the mounting structure in the pattern.
>
> Thanks for the help
> Byron
>
>
> Yahoo! Groups Links
>
>
>
>
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