Mine also doesn't work when connected to the rv's distribution box which switches between "cable", "satelllite", "roof antenna", etc. I wanted to run the "satellite" coax to the Dish receiver without going through that box.
I went to where various "in" and "out" cables are connected to the distribution box and unplugged the "satellite in" cable. I connected (using a short extension coax cable) the "satellite in" cable to the input of the Dish receiver. From the dish receiver, I could use either the HD output or the component output to connect to the television.
The Tailgater coax can now be plugged into the "satellite" input outside the rv, so you don't have to go through a window.
PS: the "satellite in" cable is disconnected from the Dish receiver for travel. My "roof antenna" cable is also disconnected (from my converter box). To keep things straight, I use colored tapes on the cables (blue for one, green for the other) and put matching color tape next to the receiver and converter box inputs.