If you dont have the fancy test equipment, best way to do it is take your tv/rec out to the dish, if thats a possibility. You might need to adjust skew a bit, and/or your elevation. I have the larger primestar round dish, it picks up the Montana PBS signal very well. Right now there's no switch on it, so I can't try to get the other pbs on the opposite polarity. They have AC-3 sound.
charles