the batwing will pick up DIGITAL ota broadcasts just fine.
the signals may be more focused/directional and phase in/out during the broadcast day.
((some stations stop or alter the transmission strength diurnally))
winegard makes a small add on (takes 2-3 minutes to install without tools) that is supposed to...
INCREASE channel capture/strength in the uhf zone (higher # channels)
it's called the wingman
read about the wingman here...
having attached this add-on, i'm still not convinced it's done much.
a TALLER antenna certainly might help with ground level obstructions...
HD is a different issue than digital ota broadcasting.