We have DIRECTV both at home and in the motorhome. We started with it in the motorhome only and had the house added later. It only costs an additional $5.00 per month for the service in the motorhome, and an additional $6.00 per month to rent the HD receiver. When the motorhome is not being used the service and rental fee can be suspended. Suspensions have to be for a full month to get a billing credit.
With this arrangement we can change our local channels to wherever we happen to be. When we move to a new location the locals can be changed again. The only downside is that when we change locals it applies to b both the motorhome and the house. We do change locals when we travel in the winter months, but not in the summer time as we often have relatives staying at the house when we're out of town. I don't think they would be interested in watching out of state local channels.
One word of caution. If you travel north of the border and don't get good reception don't call DIRECTV for a solution. They have an agreement with Shaw Communications that they will not knowingly broadcast into Canada. If you call to complain or ask for a resolution they will shut off your service until you return to the US.
We almost made the mistake of calling, but fortunately were warned of what would happen by another camper that had already made that mistake.