X2 what jimcol said - what I found when hooking up a radio antenna to the home theater system was that several of the coax connectors were just pushed on & not crimped. Two were crimped, but not on the shield (you're supposed to peel back the shield and crimp or screw the body onto it & have the center conductor stick through w/o contacting anything) - those I put some screw on types on that I had on hand. Having improperly terminated cable will mess up reception severely.
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