I just installed the new Winegard Razor antenna on the longer boom of the Winegard III / Wingman it replaced.
The RV dealer is located down in the river valley but the antenna had no problem getting all the local channels (including all low power ones) and channels from St. Cloud around 90 miles to the NW (antenna was aimed N).
Because of MH position transmitters were all off the back of the antenna spread out NWW, N, and NW. All channel signal strength were "5 bars" with a few at "4 bars".
I used my second in-line adjustable amplifier set to minimum of 2 dB (2 to 10 dB adjustable). The amplifier plays very well with the new Winegard Razor, just as it did with the Winegard III. Found 44 channels. All channels came in great with excellent signal strength with no need to aim further. There is a good chance it would work well with the Jack antenna since they are compatible as a head replacement on the Winegard boom and amplifier power supply.