My original setup was two D500's, side by side, driving a 4900, a 4700, and a 1000. I guess that installer didn't like sw64's. Whatever the reason it worked well, save for one sw21 going out, for many years.
When I went HD the installer was shaking his head at the line of sight but removed one of the 500's. replaced it with a 300, and used the then new dpp lnb's. Back then in the Pacific Northwest wing dishes were the norm as 129 was weak and wobbly.
In the end I'm glad he put up a wing dish as after of couple of years I had to move the 300 halfway across the roof to get decent signals off of 129 again. Blasted trees keep growing. One thing about the good old 300, since it's only looking at one slot it's easy to aim and peak.