It appears to my eye that you have only 1 coax cable coming out of the antenna along with the 12V power line (which comes from that oddly mounted switch). The other wire runs to the square GPS module you are asking about.
If the picture of your receiver is how it is setup at home and you are able to watch one channel and record another with only the 1 coax input then your home antenna setup uses DirecTV's SWM (pronounced swim) technology and you will not be able to use a similar setup with the Movin' View. You can add about $100 worth of hardware (simple installation) between the antenna and the receiver or you will need to get that 2nd coax cable run from the dome into the coach to connect to the 2nd input on the receiver.
You can take a look at this information from Winegard on how to update your antenna to SWM.
SWM8 Setup