If you;re tracking from 79W to 121W you should be pretty close on the arc. I'd suggest taking the receiver and tv out to the dish, and program the satellites. Use the buttons on the motor to move it east and west, start at a known satellite, program in active transponders on the next satellite east or west of it, and drive dish manually while watching for signal activity. That is just the way I did it, to make sure I was on the arc, and able to find all the satellites manually. Once you know you're tracking correctly you should be able to program the locations in from indoors.