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Most interesting reading,I have 2 Sigma 4's up and running here.Just put up #2 fresh outa the box,I have had #1 antenna since it first hit the market many moons ago,I have the gamma;s in use and I get a decent match,If I am reading correctly The antenna would perform better if I used a 1/4 wave stub? Would love to hear more,Better yet a picture of the setup would be handy also.....Jay on de Sandpile~~~~~