First off where you connect to the LNBF, there is a 1, 2, and IN. The cable go is 1, the most left coax connector.
Second, how are you getting the coax cable inside the RV?
Third, the coax cable from the satellite goes to the Satellite In 1 coax connector.
Fourth, does your TV have any other cable connectivity like RCA (Red, White, Yellow), S-Video (1/4" round multi-pin cable, Component Video (Blue, Green, Red, White, Eed) or HDMI (1/2" wide flat connector? The reason is Coax output is the more difficult way to connect a TV to setup the receiver.
Five, when you say "I could nevr receive signal" just what go you mean? Nothing on the TV, nothing on the signal meter display?