On the outside of your RV are there two coax connections (separate for Park Cable and Satellite) or just one coax connection? If there are two connections, connect the Carryout "Main" connection to the Sat connector on your RV and find the other end of that inside your RV where you connect the receiver.
If there is onIy one outside connection, connect the Carryout "Main" to that. Inside, that coax will connect to the back of the antenna booster control. You have to remove it from the booster control and wire it to your receiver. (The booster control contains a splitter which has to be bypassed.)
Then yes, you have to connect the power to the Carryout from an outside power plug.
I am curious: Why did you buy the Carryout instead of the Tailgater (which is cheaper and doesn't require external power).