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Originally Posted by jjessico
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The diameter of the PVC pipe doesn't matter. You don't even need that except for structual stability.
The things which are critical are the distance of the washers, the distance from the reflector and the diameter of the can portion. (Your X dimension.) Lincomatic has a calulator on his site for computing the optimum diameter. Look throught the Antenna FAQs. Most of the other dimensions will be either single 1/4 wavelength or multiples of that. The 1/4 wave at these frequencies is 1.22". So the washers should be 1.22" in diameter, the spacing of the washers should be 1.22" apart, etc.