If you already have DirecTV at home, they make it very economical to use their service in the RV.
Since I don't even have a stick and bricks home, I chose DISH. For all regular channels plus the locals, I pay about $100/month. One advantage of DISH is that they let you turn it off and then back on without an activation fee.
I ended up choosing the DISH Tailgater Antenna which allows me to park in the shade and put my antenna up to 50' away to get good signal. The roof mounts don't work that way. When I stay in campgrounds I just tell them that I need a southern exposure for my satellite antenna.
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