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thanks, i follow now...yes 1-3 s units is a big gain, comparable to 6 and 12 db, the gain expected of a 3 and 10 element yagi beam respectively.  i have followed your reviews and reports and have commented before that differences in signal are negligible.  I really have to sit down and do a cost versus performance trade off analysis when looking at gain and signal strength and changing antennas.  remembering that to make your signal sound twice as loud requires increasing output power by 9 db. sometimes it makes more sense in my case to keep what i have and upgrade coax cable.