Welcome madkx to the forum & irv2.
Here is a Owners Guide
for some info on items you now have a problem with.
Here is a photo of my set-up in coach:
Your problem now is to identify all the cables to different TV's and cable from electric bay so you can hook up correctly.
The cables may have tags which mine did not so you need to use a meter to track them down.
You can short the cable lead out at the particular TV location with a jumper wire from center pin of cable to shield jacket of cable and read a short on meter or hear a buzz if it has one in meter.
The ANT booster is the left button on control box you push in and have a red led when operated.
This Owners Guide
of 04 coach will explain the cable box that you and I have.
If you didn't have a LCD tv than you may have had a HD control box for older TV with a remote that RADIO Shack sells.
Now maybe the time to place a new LCD and in the QT's links
there are many conversions for your viewing.
What you have in your hand will operate you new LCD and other TV's in coach.
The King Dome cables should be there in cabinet you need a control for it and it's cables would plug into box in your hand.
The red & white wire is 12v for cable box with a plug on end of it into box.
Here is a Brochure of 03 MA.
Know what you going through had a coach with alarm and they still broke in took TV's, tape, micro smashed windows just a pain ITA.
Let us know how you make out.