Here is a link to the Winegard website to view the manual for the switch box that Milo referenced. This is the box that came in my '04 coach, wired by WRV just as it shows. And I left this wiring alone, other than using the mini-coax leads I referenced earlier in this thread. I would just not connect the "TO MAIN TV" coax. (And neither did WRV, since the plasma TV in my coach does not have a coax input.) My coach came with this wiring diagram, and it was correct.
Wiring as shown allows you to view any one of the inputs (antenna, cable, VCR, satellite, or DVD) on the bedroom TV or the outdoor TV, if you have one.
Assuming you might want to use the antenna and the cable TV, I would suggest getting a DVD recorder with both a digital and analog tuner. Use it in place of a VCR for tuning the over-the-air antenna or the cable. The digital tuner will allow you to receive digital HD signals off the air for free!! Or if your LCD TV has a digital tuner built in, any DVD player is good, and connect the "TO MAIN TV" coax to the coax input on the TV. You don't need an external tuner like I did.)
Then connect the component video output (or better yet HDMI if the TV supports it) from the DVD recorder to the component video (HDMI if available) input of the LCD TV. Then if desired connect the coax output from the DVD recorder (if it has one) to the "FROM AUX" input on the Winegard box. This would allow you to view the DVD recorder output on the bedroom TV if desired.
If you use a DVD recorder as a tuner, connect the "TO VCR" output connection on the Winegard box to the DVD recorder coax input instead. And the DVD recorder coax output to the "FROM VCR" Winegard connection.
Then connect the component video output from your satellite receiver (or DVR) to a second component video input on the TV. (Newer TV's should have more than one. If not, buy a component video switch.) If you have or want satellite HD channels, you HAVE to connect with either component video or HDMI to get high def signal to the LCD TV. If you don't have HD (like me), then the S-video connection is sufficient. In that case connect the S-video output from the satellite box to the LCD TV S-video input. As the Winegard switch guide shows, also connect the satellite receiver coax output to the "FROM SAT" connection. This allows the satellite output to get to the rear TV. (Both the front and rear TV's will get the same channel.)
Audio connections depend on what type of sound system you use. The easiest is if your TV has an audio out connection. Then you would need to connect the satellite receiver and the DVD recorder audio outputs to the TV. (HDMI includes both the audio and video in one cable.) Then the TV audio output to the sound system input.
Clear as mud? Thought so. Sorry about that.