I replaced the OEM older version winegard with the Jack Digital HDTV Antenna
as one of my first MODs on our new Sabre. At first, I was going to add on the "Wingman" to help with the UHF-HD, but after seeing a demo at an RV show I decided to spend a little more and try the Jack Digital. I did install the Wingman on our previous TT and got good results with that as well.
I only have one piece of data to share...the "before and after" test on the side of my house produced ~ 11 more channels using the Jack Digital Antenna. btw..it was a very easy unstall, but not as easy as the Wingman. I don't have any actual data comparing reception between the Wingman and Jack digital, but my feeling is that the Jack does a little better.
I also use the King Control Dig TV Finder
which helps locate th strongest digital signal prior to doing a channel scan
Just rotate the antenna and peak the signal strength. Works great...especially in fringe areas
Hop this helps.