(I couldn't get the quote check-mark to work so I did it manually)
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If you omit the VHF antenna, you will very possibly eliminate the need for the CH-13 filter. The built-in balun of the 91XG will pass some VHF, but at lower levels.
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Thanks! Good to know.
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I've used chain-link fence 'top rail' from Home Depot. It's 1 3/8" in diameter, and has a swedged end. I believe the price is about $12 / piece.
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The fence rail shown in my photo allows wobbles with a breeze. That doesn't seem good to me. It is 8 feet long and, due to the roof pitch, only about a foot of it is fastened by the mounting clamps. So, the antenna is about 7 feet above the roof. An expensive yagi deserves better so I ordered two 4 1/2 foot masts from Walmart at 8 bucks a piece. I'll get the guy hardware from the local Rad Shack.