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What is the correct or mostly used measurement  for build a multiband   dipole already have a 4,1 +1:1   balun.. but  am seeing different  measurement..also how. high from the ground   I read 40ft  a d each end 10ft. I currently have one but awful swr on 80m .whe n I test the balun with a 200ohns across the swr is 1:!  From 3.500-28mhz.but whrn I afd my wire 0m is high I am using 90 and 45