105 121 satellite ?

[stinkfist]

Hello I have been reading alot about the 105 and 121 satellite's. I have a 310.010 and 721 that I would like to get more locals with. I bought a prime star dish that has a KU band LNB on it which I need to get the 105 or 121 sat's. I also have a dish 500 quad. All I should have to do is use a sw21 switch and hook one input to the prime star dish and one to the quad. Is this correct? Is there a list of locals that I can get with theses sat's. I live in the seattle area and would like to get Arizona and Alaska locals. Is this possible with the 105 or 121 sat's? :) :)

Thanks