On Thursday, November 6, 2014 3:15:23 PM UTC-5, 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

I never would have figured. Maybe I can come up with a way to transition from PVC to .5 inch copper pipe for the radiator. Thanks, Lenny

You can buy a decent 10 / 11 meter ground plane antenna for about $69.00 - why in the heck would you want to build one out of plastic pipe?

"Channel Jumper" wrote in message
...

You can buy a decent 10 / 11 meter ground plane antenna for about $69.00
- why in the heck would you want to build one out of plastic pipe?


Because he is a ham.



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On Fri, 7 Nov 2014, Ralph Mowery wrote:


"Channel Jumper" wrote in message
...

You can buy a decent 10 / 11 meter ground plane antenna for about $69.00
- why in the heck would you want to build one out of plastic pipe?


Because he is a ham.

I would have said "Because he's not a CB'er".

Michael

Channel Jumper wrote:

You can buy a decent 10 / 11 meter ground plane antenna for about $69.00
- why in the heck would you want to build one out of plastic pipe?

Because you can make on for about $20 even if you have to buy everything
new and even less if you have some extra wire and pipe.


--
Jim Pennino

On Sat, 8 Nov 2014, wrote:

Channel Jumper wrote:

You can buy a decent 10 / 11 meter ground plane antenna for about $69.00
- why in the heck would you want to build one out of plastic pipe?

Because you can make on for about $20 even if you have to buy everything
new and even less if you have some extra wire and pipe.

On the other hand, I once bought a CB set at a garage sale (I had
intentions for reusing it) for all of five dollars, and they threw in an
SWR meter and the whip antenna. I couldn't be bothered carrying the whip,
so I left it, but at that price, it probably could have formed a good
basis of a 10M antenna. And back in the day, I remember various projects
that used CB whips for other bands, simply because as a mass produced
item, they were cheap and easy to find.

But no, if you have to pay $70, scrounging will always be cheaper.

Michael