Ken,
Winegard site has pix of the various generations of the batwing. Early versions really benefit from WingMan like ours did. At a certain point in their evolution, the capability the wingman adds, was built into the antenna head.
If you have one of the earlier Winegard Batwings it WILL benefit from WingMan. Weird, it attaches with push pins into the bottom of the antenna head. No tools (maybe a pocket knife) and no wiring connections. But it does something to affect the wave pattern and you magically get more of the high band digital stations.
It attaches to the bottom of the head and extends away from the side opposite the arm attachments. Be sure you have clearance beside that head to let it fold down onto the roof.