This is like what it looks like. A regular 12 inch ruler on the vent pipe mount. The ruler might be used to keep my 2 Meter/70cm J-Pole antenna away from the metal vent pipe. Just thinking ahead. It is always good to experiment. You can see the edge of my S9v 18' MK II antenna against the vent pipe. Photo taken on Sat, April 23, 2011
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