Quick followup to this thread. Finally got the Winegard HD7084P up this past weekend. Pointing it at NYC and getting the Philly stations from the back as suggested above.
Got ~35 channels (to some level) without a pre-amp. [Again, we live in a *very* wooded area with lots of leaves in the direction of the NYC and Philly antennas.]
Added in the Winegard AP8700 pre-amp and got ~52 channels, and much more solid signals for some of the weaker channels.
Will do some more pointing tests this weekend but it already seems like a success.
Thanks again to all who helped here.