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Author Topic: Patio cover ground plane for vertical  (Read 1670 times)
KB5JO
Member

Posts: 66




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« on: December 18, 2005, 08:54:10 PM »

My house has a 12' x 24' aluminum patio cover.  Can this substitute for elevated vertical's radials?
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KA0GKT
Member

Posts: 555




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« Reply #1 on: December 18, 2005, 10:07:19 PM »

6' is approximately a quarter-wave at 41 MHz.

12' is approximately a quarter-wave at 20 MHz.

Any counterpoise is better than no counterpoise, however the roof will work best at 6-meters and abovewhere there is at least 1/4-wave in all directions.  It'll be fair on 15, 12 and 10 Meters assuming you mount the antenna dead center to take greatest advantage of the ground plane area available.

73 DE KAØGKT/7

--Steve
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WB2WIK
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Posts: 21836




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« Reply #2 on: December 19, 2005, 07:59:43 AM »

...and also, only if you actually attach the base of the vertical at its feedpoint to that aluminum patio cover.  Having the vertical just sitting there without a very good and direct electrical connection isn't going to help.

Also, be sure that if the patio cover isn't a single piece of aluminum (and it's probably not), the individual sections that make up the cover should be well electrically bonded to each other without oxidation (or paint, or anodizing -- which is non-conductive) between sections.

WB2WIK/6
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