Our unit is a 30C. We have used the main TV over the door using the digital antenna and it works properly. I have attempted to hook up cable twice now and have not been successful either time. This time the cable repair man was in the park and I had him check the post for signal. He said there was signal at the post. I have the cable connected from the post to the cable connection in the UDC. Behind the TV in the main room there are 2 connections on the wall. The TV was originally hooked to the top outlet and the antenna works properly as stated. The cable in this park needs a box to work, I have hooked the box up to the lower connection and then to the upper connection and all I get on the TV is "Searching for channels". What else can I do to get this to work? Thanks