Unfortunately, the RV manufacturers have gone to that antenna for most new RV's, and even though it is a King/Jack antenna...it has proven to be junk, unless you are within 30 miles and line of sight from the broadcast antenna.
The King/Jack batwing antenna replacement head (the one I have) is a tried and true model that almost anyone that has it...loves it!
As for them not working at all, chances are the wiring in your RV was screwed up upon installation at the factory as well and that omni-direction model being junk.
Now, I'm not slamming FR as my Heartland 5'ver was also wired up completely screwed and I spend days figuring it out after I gave up on my dealership THREE TIMES after they proved they didn't have a clue how to wire up a TV antenna, either.
I live in Yuma, Arizona, where the local TV stations are broadcast from 65 miles away in El Centro, California, and my King/Jack picks them up as well as my home antenna, that has a listed range of 150 miles.