If you are using Dish 712 or their RV unit connect the RV antenna to the ANT IN on back of receiver, then in main menu find Local Channels and have the receiver scan for stations. You will then be able to use your SAT receiver remote to watch locals. You may or may not have to turn the RV Antenna amp off, I don't also your set up may require you to use one of the 1 x 3 split units and don't forget to raise your RV antenna and lower it when done.
Roger & Mary Forbes
Little Lady (Dog)
2014 F350 / 2015 CC 36 CKTS
Days Camping 2014-96, 2015-130, 2016-85 and counting