Hi. I have a dish 6000 with off air card and live 20 miles E of Seattle. I have tried to get some local HD reception using a Channel Master directional 3023 and a Terk 50. Both using pre amps. In either case when I turn the amp on the signal goes to 0? When off I get 50 - 60. Why would the signal go down when the amp is on? I have tried several locations for the anttena but get the same results. Has anyone had a good experience with the dish 6000 and a UHF antenna with a pre amp? Also is there anyone out there selling a UHF signal stregth meter to help me find a good location? Thanks.