There are no "digital" antennas except in the minds of an antenna company's marketing department. A good working Winegard batwing works well, and even better with the addition of the Winegard Wingman UHF booster and their SensarPro signal finder/amplifier. If the King Jack worked substantially better for someone, there's a good likelihood their previous amplified batwing had failed in some fashion, or was the low end non-amplified model supplied with some low end RV's years ago. A licensed broadcast engineer and respected member of this forum has scientifically tested both antennas, and determined that the batwing/Wingman was superior to the Jack, particularly for the VHF channels.
Batwing vs.BatMan vs. Jack: The Results..