Directv

If you do not have a power inserter at home (PI25) for use with your HR24 you will need to pick one up to use the antenna you are describing (model # not necessary). You will not be able to use the cable connection coming into the RV as it currently exists and it's likely you will not be able to use it at all. The cable connection goes to a splitter (likely a wall plate with an off/off button or switch) that allows the selection of Cable input or OTA TV antenna input. If this is a direct run you can modify that connection and add an A/B switch and an additional coax run to the receiver to make it work. This connection should be where the main TV is located so you can use the HDMI cable and get HD programming to that TV. Any output you use from an connection other than HDMI will get a signal to the 2nd TV but it will be an SD picture. That may be OK if it is seldom used or a smallish TV anyway. I suspect you have the 3 color RCA connections (Red/White/Yellow) and you can get an adapter to convert that output to coax for the 2nd TV.