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Telescopic aluminum question
I am considering putting up a ground mounted vertical antenna, based on using telescopic aluminum tubing such as is available from Texas Towers or DX Engineering. Tubing available ranges from .500 inch to 2.125" with corresponding increase in price as diameters increase. My vertical should be limited to a maximum of 30 feet, but preferrably around 23 - 25 feet. I will feed it with an SGC coupler at the base and operate 80M - 10M. My question: Using the 6' long aluminum pieces, what is the minimum diameter sizes I should start with to enable the antenna stand up to a 75mph wind UN-GUYED. Also, how much "overlap" should I use in the telescoping pieces? I will consider alternative means of building the vertical, but I really wish it to be unguyed . Any info or recommendations appreciated. TNX Ed K7AAT |
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