Need help!

[tmonday]

I have been using the Terrestrial Digital DB8 Multi-Directional HDTV Antenna for about a year now. All is well with it. Just have one question that maybe you can help me with. I have two DTV's one only uses the OTA and the other OTA and Dish Network. The one closest to the antenna (hanging on the wall where the antenna is mounted outside) pulls all of my locals in fine, except for the PBS stations. They have pixelization every now and then. The other set OTA cable runs into Dish Network's receiver and is located about 40 feet from the antenna. All channels come in well, except for PBS. They will not come in. If they do manage to come in it is for a few minutes at the most. Is there anything I can do or add to increase the signal or gain. I have the cables running the most shortest possible distance. They are RG-6 and are grounded with a 4000 joules surge protector.

[tmonday]

I have tried the amps from Radio Shack with no luck, they only decrease the gain instead of adding. I run one of the OTA cables into Dish Network due to it adding it to the program guide. As of now WXII is at 70%, WFMY 95, WGHP 82, WCWG 81, WXLV 100, WMYV 93, WLXI 75. When WUNL comes in it is around 60%. The set closest to the antenna is around 85%. So I think my settings are good just the distance from the antenna for the second set. I check on some amps I found on the web and they state do not work if passing through Dish Network receiver. Is there one that would work while passing through receiver? Out of curiosity I installed the Philips MANT940 Indoor/Outdoor HDTV Antenna next to my main set and it will pull in the PBS channels great. I live in the 27360 area. Any help would be appreciated. Thanks!