here's what I did in my cyclone, i assume it would be the same to your big horn. it requires no additional parts or modifications to your rig.
1) I ran the cable from the tailgater to my Satalite coax barrel that feeds the living room this is trial and error as my cyclone had two satalite inputs one to the living room and the other to the bedroom.
2) install 211k in living room with HDMI to the living room tv and Coax out to the living room cable/air coax barrel. If you don't have a HDMI port on your tv you would need to buy a cable splitter for the coax out from the 211k and send one to your tv the other to your air/cable connection.
3) connect all other tv's in your camper to the cable/air coax barrell (the amplifier must be off for this to work)
4) tune all tv's connected to cable/air to channel 3 or 4 depending on your 211k settings and enjoy.
optional 5) use this
rf remote extender to change channels from anywhere in your coach with your 211k remote. if you don't get something like this you will have to be line-of-sight to the 211k to change the channel.