We have researched but also never found an overwhelming consensus on what was "best". In the meantime, we had an old set top rabbit ears that plugged into an old TV we had many eons go, and just threw a contraption together while we awaited a decision on our never-ending search for the perfect RV TV antenna.
The rabbit ears actually work out pretty well, depending on how far from the broadcast station we are (our camping tends to be in the boonies and surrounded by signal robbing trees and mountains).
Our setup has provided "zero" stations on some trips, and over 50 on others. Most trips we seem to get at least 2 or 3 stations at least. If we don't get any stations, we fall
back on radio and books. The best we ever did was in the NE GA mountains where we were high up and obviously must have had a good enough line of sight to pick up over 50 individual channels from Atlanta, even though it was over 50 miles away! We usually remember to check the FCC website
to see where we have to point the antenna to "get it in the ballpark" and then fine tune if we get a weak signal.
The biggest benefit of this antenna is frugality. We stick the antenna on top of an extendable painters pole, which we insert through a PVC "T" which is attached to our rear bumper with plastic ties. The pole goes through the "T" and rests snugly in one of the leveling blocks that I place under the rear stabilizers. I added a cable input to the rear of the Scamp
so I can attach a cable to pass the signal through the wall.
Interesting thing about antennas; at home I gave up satellite once I discovered that I could pick up all the major stations using a very directional antenna in my attic. I later made one of those homemade antennas that are made out of coat hangars and 2x4s for the camper but decided to try it out in the attic first. It actually picks up more stations than the directional antenna! (I leave it in the attic now) Guess this is because some stations are several degrees left or right of the majority of stations, and the directional antenna gains a better signal from the ones straight-ahead, but no signal from those off to the sides, but the homemade antenna has more slop and picks up the "side" stations better, and still picks up the "straight ahead" stations good enough.