David, completely agree. My comments are based on anecdotal experience at the beach on the East end of LI, far away from any big city. Previous years in the TT with the Winegard, we would pull in about a dozen channels from CT and LI.
This year with the King we got about 35 channels from CT, LI, and RI. Could have been favorable weather/atmospheric conditions? I was concerned about the lack of height without the crank up mast, but doesn't seem to be an issue...I would also say if Jeff's tests are more than a few years old they are probably obsolete.
Not saying that the KingJack is superior in all circumstances....OP asked if anyone replaced their Winegard with anything else....I did, and am reporting favorable results. My post was not meant to be a side-by-side spec comparo.