Look at the weingard gm-1518 carryout it is the best of both worlds. You can mount the carryout on the rear ladder with the optional ladder mount and the 5th vehicle can be traveled with in in place with no harm according to weingard tech support. At campgrounds where the southern sky is not in sight due to trees or other obstructions blocking the signal you can then remove it from the ladder mount and place it on the ground to obtain signal without the obstructions as when mounted on the rear ladder. Look at the weingard site and you can obtain more information on the ladder mount for the carryout under accesories.
Johnboytoo is correct. We have DirectTV in the RW and the Genie is in the LR with "clients" in the BR and Basement.The "clients" do have an additional fee. They are very small and just make all the TV's work together. We love it!