Well the Winegard that came with the RV plus the Wingman that I added are not impressive performers - at least not in the state parks that I like to go. I might get one or two channels at best. I would be willing to swap out the masted Winegard in favour of this Jack antenna (a) based on We Can't Wait's experience and (b) YC1's attestation that it is an easy swap.
YC1 - Based on your installation experience, I take it that both antenna lead and power lead are both accessible on the rooftop and this is essentially a case of mounting the Jack antenna and then plug and play? IOW is there any "invasive surgery" required?