Go to the Winnebago's tech site. Click on the link for "Wiring Diagrams Motorized". Click your "Year range" followed by "specific year". Click your "model and sub-model".
Next pick "TV Coax Wiring Diagram" to see the schematics of how the systems connect. This will let you know if there's something else acting as a junction point between the cable ends. You don't want to be yanking on cable not realizing a splitter or grounding connector or other item is connected to what you think is a single straight cable.
Next pick the "TV/DVD Wining Installation". This will bring up an exploded view of your entire entertainment system, how mounted, where all the pieces are. It generally will give you a good idea how the wires are routed and through and where in the cabinet and coach they go.