Since you said "Portable" I am going to suggest DISH NETWORK (unless you already have a direcTV account at home)
There are many portable antennas for Dish including the Tailgater which is specifically designed to work with the VIP-211 line of receivers and the Winegard Pathfinder X-2 Which is the one I like best at least on paper.
DISH works well with a SINGLE RECEIVER and a portable "dome" or "Cube" type antenna... (With multiple receivers or multi-channel DVR's you really need a "DISH" type antenna)
Basically this is what I recommend.
First: your account should be an RV account, again unless you already have a house account.. Legal reasons I woudl rather not go into today.
Second. Install the receiver near the main TV or the target TV in any case and connect using HDMI cable (IF You have multiple TVs ask about the 2nd)
Now Run BRAND NEW RG-6 Coax (Do not listen to the "Re-task the park cable" folks, Install NEW RG-6 to any handy connection point,, OFTEN this can be done without drilling a hole but if you need to drill. Have no fear. it's not that bad (I did it both ways) To do a no-holes in siding install find a way into the channel where the water pipes run and drop down to the basement that way (or under the RV)
Now: Set up and use,, This is basically the VIP-211/tailgater version.
With Receiver NOT PLUGGED IN, (or power to it switched off) hook up antenna. Look for a spot where you have a clear view of the South West (Equator south of Hawaii is a good "Target angle" NOTE: Sat Finder apps for your smart phone can really help here. Set Tailgater down and secure it against non-approved legs.,
Plug in and turn on. It should set up
Winegard Pathfinder.. Same thing only I do not know how the pathfinder gets power.. You may need to hook up a power cable for it.
Job done
You do need to call DISH with your account number when you move so you can get Network TV (ABC, NBC, CBS and so on) since Fox is a jerk.