Two things.
1) DirecTV's line of site to their core sat locations of 99w, 101w, and 103w longitude are higher in the sky (46-47.5 degreese elevation) than are Dish's at 110w and 119w (42 and 36 degreese elevation). With the trees around here, that is a big difference. Plus, the look angle is not as wide. Directv also has sats at 110w and 119w, but are not needed for the Atlanta market unless you want Latino or Chinese programming located on 119w.
2) Dish does have the new "eastern arc" group of sats at 61.5w, 72.7w, and 77w. The view to these birds is to the southeast (instead of southwest) for the Atlanta market, and the elevation angles vary from 43.5 to 49.5 degrees. In any case, higher then the western arc birds at 110w/119w.