Direct TV Genie

Popsie had it right the first time. If you want to use a Genie you must have SWM hardware. There are many ways to do this but if you want to be able to receive the DirecTV HDTV programming you will need an open face antenna and I would suggest you get one with the SWM LNB. Nearly all markets can use the SWM SL3 LNB but a few still require the SL5.
Now, if you want full use the of Genie (and a client if you like) but can get by without HD, you can buy a portable automatic antenna as well such as the Carryout. None of the domes style antenna can receive the DirecTV HD channels but you can add a SWM8 kit to these units or even a simple single LNB antenna and your Genie will be fully functional.

You need a tripod, a directv slim line dish with a SWM SL3 or SL5 LNB, coax cable, and a SWM power inserter.

You put the dish on the tripod and aim it at the satellites, the coax cable goes from the dish to the SWM power inserter, and from the power inserter to the receiver.

You can buy all the parts on from solid signal, amazon, ebay, etc. or take a chance on Craigs List, etc.

You will probably need some help learning to aim your antenna, but using dishpointer.com or an app on a phone will make it pretty easy.

Assuming you have a phone, all this should cost you less than $200.

For a lot more money, you can get an automatic roof mounted antenna for your RV.

EDIT, since you only have the one receiver, you don't need the SWM stuff, so you can buy everything you need for less than $150.