Look here:
http://lyngsat.com/america.html
Anything in GREEN is KU band and will be picked up by your dish.
This assumes your dish can "see" the satellite (not blocked by trees etc).
On the Lyngsat site, open each satellite by clicking on them.
Look for "F" on the Video Encryption column, this usually means they can be received via "Free".
At the bottom of the pages are the total number of Free and Encyrpted transponders. If there are little or no free channels, its prob. not worth taking a look at...