Mark,
Quite often, metal roofing is not electrically bonded well from
one section to the next. So, your results may be good or very bad. I
tried it once on an old farm house with a flat metal roof on one newer
addition. It was horrible. I had to run radials before it became
useful. So, if it's not too difficult, try it and hope it works, but if
it doesn't then you'll have to decide whether you want to run radials, or
relocate it to where radials will work better (ground-mounted.)
73, Duane
On Tue, 21 Jan 2003 12:23:39 -0500 "Mark Erbaugh" <mark@microenh.com>
writes:
> Since most of my HF equipment is TenTec, there is some tangential
> relationship to this list <g>.
>
> I have a 24 by 48 foot metal barn with a metal roof. The peak of the
> roof is
> about 20 feet high. Is there a wait to exploit this structure as a
> ground
> plane for an HF vertical antenna? What kind of performance
> improvement (if
> any) could I expect over the same antenna mounted on the ground.
> Would I
> still need radials?
>
> Currently, I have a Butternut HF6V and a Cushcraft AV5 antenna
> available. I
> also have a Gap Challenger, but I understand that it doesn't use a
> ground
> plane (elevated feed point). Would it be worth trying any of these
> antennas
> on the barn roof?
>
> The ham shack is not in the barn and the barn would not normally be
> occupied
> (it's just storage) when I'm on the air, but would RF exposure
> inside the
> barn be an issue.
>
> 73,
> Mark
>
> P.S. There's 2 inches of snow on the ground and temps in the 20s and
> I have
> good antennas up now, so this is just a though experiment for later
> in the
> spring.
>
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>
>
Duane Calvin, AC5AA
Austin, Texas
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