Thanks for the quick reply. You're correct - the HT1100 is my modem, I just went to Dishnet and looked up my equipment. The adapter to get the antenna stations to the DVR via USB is an OTA Dongle.
The line from the outside dish goes to the "Sat in". My TV is HD but does not have a HDMI port, so the RBG (bottom row) on the DVR goes to that input on my TV. The row above that - White, Red, and YLW go to a common modulator (channel 3 & 4). Coax from the output of it goes the Joey2.0 on my second TV. The second TV has HDMI so it is fed by HDMI cable from the Joey2.0.
I tried taking off the coax from the Satellite, and putting it into a diplexer. I ran a short coax from the diplexer to the DVR, and the coax from my camera feed to the diplexer. That did not work. I tried adding a diplexer to the line between the antenna and the OTA Dongle, that did not work either. I tried taking the antenna out of the picture and ran the camera feed directly into the diplexer, that also did not work. Then I bought the agile modulators, and repeated all the above procedures, which also did not work. (I have a splitter on the coax from the camera feed going to the second TV, which I can see from the main TV, and the camera feed remains constant.) I tried 2 different diplexers, "Perfect Vision PVDP3 diplexer", and a "Holland STVC". They look identical but for the brand.
The picture of the whole back of the Hopper is from the Internet. The partial pictures are of mine, as is the picture of the Dongle.