I been there and done that. You need to get a SWM 8 (as I recall) switch and power inserter off of amazon and get it hooked up out at the 18" antenna.
That will give you the single wire into the Rv however there will be no HD.
I did not like that and decided to go whole hog. So I got the slimline 3 off Amazon with the power inserter you need for it. Had to get another tripod and mast since the slimline is larger diameter. I now just set the tilt and elevation and usually grab the satellite on the first swing thru.
both ways that I described will work with the genie.
