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John Davis[_3_] · November 12th 14, 12:16 AM posted to rec.radio.amateur.homebrew

On 11/6/2014 3:15 PM, wrote:
I'm planning on building a 10 meter ground plane antenna out of PVC pipe and #12 wire radials drooping about 40 degrees. This will be mounted on my roof on a tripod and mast, with the radials also serving as guy wires. The ARRL antenna book mentions that a ground plane antenna should be mounted at least one half wavelength above "ground". I know that this sounds like a stupid question but I have to ask: for this example do I consider the roof, which is more than 5 meters above ground level as "ground" or do I need to be at least 5 meters above the roof. I would like to secure the radials, (guy wires) to my roof, but with the antenna at 5 meters high my droop angle will be off and then I can't guarantee a 50 ohm match. The house is wood frame, no foil backed insulation and a non metallic roof. Thanks for any advice. Lenny

The ground is that muddy stuff your wife calls DIRT when you track it
indoors.

He's Older than dirt!
(Well yes he is cause he watched the building being built and it was
EARTH or GROUND before the building was built, it did not become DIRT
till it was tracked indoors).

The office I retired from.... Well,, See above. I watched' em buldoze
the building that used to be there and build the new one so I was, in
that office, older than dirt.

--
Home, is where I park it.

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