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On the channel master 7777amp they say it's a 30DBV in VHF/uhf 30,now they say when you T off one to vhf at 15,&uhf,15,so 15+15=30,N is,3: I ASKED a channel master TECH and that is what THEY sead about the,cM, 7777AMPLIFIER,and the Johansson,NOISE,is,3,5,VHF,30,DB gain /uhf,AT 40, I have used #30-2475,&76,,17channels I receive I don't see enny diffinrent between the two antennas and that was with the channel master,and then the Johansson, just a better picture with the Johansson amplifier,antennas Higth is 40/ft 01550,zip,And the A G L,30,tv fool report, in Massachusetts hills and mountains signal strength 80,rain or snow no dropouts,we'll good luck to you,
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