NO DirecTV has no Month to Month plan.. The antenna however MIGHT work with Dish Network (you will need to contact KVH to ind out how to re-program it) "Dome" type antennas fall into basicall 3 groups when mounted on the roof (4 if portable)
The 4th (portable only) is the Tailgater, this is speciffically made to work with the Dish VIP 211 and selected other DISH receivers and should not work with DirecTV. This is the only exception I know of (Not saying there are not more)
Rooftop domes (And other domes) fall into 3.1 groups.
First: ALL of them see one satellite at a time, and only in one band.. For a single channel DISH receiver, that's good.
Some are programmed for a sigle satellite,,, but from inside the coach and you can easily change the aim.
Some are programmed by DIP switches inside the dome (not so easily modified).
Some can be set so that a DISH receiver can pick between 2, or better yet 3 satellites.
The last kind is the best.. A 3-bird receiver controlled dome works 100% with a single channel DISH receiver like the VIP-211 line.
It will not get DirecHDTV (can be used with DirecTV just not HDTV) but it will get Dish HDTV. What it does not work well with is dual channel or multi-receiver installs. That can take 2 or 3 domes. (And a switch).