I can't properly align a satellite dish without the help of a "signal meter" such as this one...
http://www.sadoun.com/Sat/Products/Accessories/Meters/SF-95-DSS-FTA-Satellite-Signal-meter.htm
With this meter, I can make my dish go back and forth in the arc and it will get a reading as the dish hits each satellite.
When first setting up a dish, I will get the due south satellite, then move my dish back and forth, and will get satellites to either side, then nothing!
So maybe 3 or 4 satellites at first.
Then I move the dish to the furthest west or east satellite. I adjust the meter so the needle points in the center. With my hand, I push the dish downward a bit and see what happens on the meter. Then upwards and see what happens on the meter. If I need to go down (signal gets better), this means my arc needs to go down.
Then I move my dish back to the center sat. To adjust the arc smaller, I adjust the arc adjustment UP, then the dish elevation DOWN to get that due south sat again. Then move east/west again and see if I get more sats.
Hold a baseball in front of your eye and face south. See where the curves or the "arc" of the baseball come down. Now hold a basketball in front of your eye and face south. See where the curves or the "arc" of the basketball come down. The curve or "arc" is wider with a basketball.
Now have someone hold up a 10 ft. piece of plastic pipe. The ends "droop" down. This is a real wide arc and more like the arc of the earth (and the arc of satellites).
If you need a "plastic pipe size arc", but your positioner is adjusted for a "basketball size arc" (exaggeration), then you can see why you would just get the satellites at the top of the arc only.
The dish arc needs to be exactly identical to the arc of the satellites.
Now hold that basketball in front of your eye and face south again. Move the basketball east. The arc is the same, but you have moved the entire arc east.
So you can have the correct arc, but the arc is not aligned with the satellite arc. This adjustment is to rotate the entire positioner on the mounting pole. Symptoms of needing this adjustment are that the arc needs to go higher on the east, but lower on the west (or the opposite).
When the dish is perfectly aligned, you get all the sats in the arc, you can press up on the dish and get a lower reading, or down on the dish and get a lower reading. This is with any satellite in the arc.
This took me a week to get just right the first time I tried. Tons of patience. The 4th and latest time I did this, I spent 4 hours on Saturday, then 6 hours on Sunday lining up my dish.