A cable connection is for exactly what it's labeled. Cable, park Cable, not satellite.
As mentioned above, the cable line goes somewhere but not anywhere that is, by default, useable for satellite. It all depends upon the way the manufacturer setup the coach. If there are ANY splitters in the coach for the cable to run to various locations you will likely never be able to use this connection. If the incoming cable line runs directly to a Video Control Center or directly to a wall plate where there is an off/on button/slide then there is a possibility that you could modify this connection to work with satellite. It's best to check with the manufacturer but if you post in a forum specific to your coach you will also likely get the information you need.