In our '15, each TV has its own coax connection which is switchable from the antenna or cable. We have the entertainment center option in the cab-over, and the antenna amplifier switch is located behind the overhead TV. If the green light is lit, the amp is on. If you're connected to cable at a campground, make sure the amp is off.
Satellite is another story. Our coach originally had a Sat antenna mounted to the roof (standard equipment, I think), but the original owner of ours had it removed. I never did figure out how that thing was wired, so I bought a Dish "Tailgater" portable setup and use it. I put the receiver behind the cab-over TV, and bought a wireless HDMI system (IOGEAR Long Range Wireless 5x2 HDMI Matrix PRO with 2 Additional Receivers) to send the Dish programming to all of the TVs. It works really well so far.
I should also note that all of the TVs in our coach were connected to the DVD player in the dash using standard RCA cables. It worked, but the picture was horrendous. I was pretty disappointed to see Jayco put decent high def TVs in there and not bother to use HDMI connections. I think they fixed that in the 2016's.
Ty & Deb Montag
2015 Jayco Seneca 36FK
2014 Honda CR-V toad