Well it depends on what longitude you're at
As an example, I am at 93.3W (Minneapolis, MN). My SG2100 can get from 148 (Dish 148) over to about 30 degrees or so before the dish hits the brace to keep the mast from moving.
So if you're at say 97 west you should be able to get most of that too as long as you have line of site.
The +-70 "claims" the motor can go 70 degrees off your true south either direction but I know that probably doesn't work. There isnt much east of 58W except for Hispasat at 30W which has Spanish & Arabic stuff (heckuva interesting combo)
So if you don't care about that, you can easily get 72-129 which are the far east & west KU satellites no problem (again, depending on line of site)