2 ways to check
-go outside and look. The Western Arc dish (which you need) will be facing SW to W. Eastern Arc (which is used in some areas in Eastern time zone) faces SE
-on the receiver hit the "system info" button. It should show what satellites you are receiving. If it says 110,119,129 then you're all set. If it says 61.5, 72, 77 then it wont work