Its going to get complicated and expensive at the same time.
You will need a HDMI splitter (1 HDMI in and 2 HDMI out).
You will need HDMI over coax extender/converter set (1 transmitter and 1 receiver).
HERE ($60-$300 depending on model)
You will need extra HDMI patch cables to make the connections..
Output of sat goes into the input of the splitter.
One output of the splitter goes to your front TV near the sat unit.
Other output of the splitter goes to the input of the HDMI to coax converter transmitter.
Coax from the rear is connected to the converter output.
In the rear, the coax from the front connects to the input of the coax receiver.
HDMI out from the Coax receiver converter goes to HDMI input of TV.
Be aware, once you make this change, the rear TV will no longer be able to view any OTA channels from your RV antenna, it will only be able to watch the Sat output.
The cable routed to the back must not have any signal splitters in the path.
Personally, For the money, I would run some "Cat5-Cat6" Ethernet wire from front to back and use HDMI to Ethernet "Cat5-Cat6" converters instead. This allows you to still have the OTA antenna as an option and is a much lower cost option..
HDMI over EthernetNo computer network involved, the units are just using thin lightweight low cost network wire instead of coax. The cable is cheap and easy to route and the converters start at $30 for a set..
In both cases, I would highly recommend making sure that both the coax or Ethernet converters are not "passive" types, you want the ones that use a power supply on each end.
The passive converters do not work as well and I have had issues with them failing on some long runs for computer projectors.. Solved that problem once I replaced with ones that use a power supply.
I would not recommend RF transmitters and if possible to avoid using them as they can be problematic and expensive..
