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Ground plane antenna
wrote in message ... 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 You can think of the ground as being the actual ground for your case. Even if the roof was a conductor it would not be large enough to actually be called the ground. Unless there conductors for several wavelenghts around the antenna they usually have little effect on the antenna. if they are below the radials. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com |
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