Go to your setup menu and display the transponders. Most of the spot beams on Dish are on 110. As you step through the transponders, have a list of what's on them using Lyngsat. There are also spot beam maps available that show the approximate coverage. There are many overlaps where you can see signals from markets that may be several hundred miles away.
Of course you will only be able to see channels in the market you are registered for. But if you are contemplating changing your "physical address", it would be nice to know if you can get sufficient signal to view the channels once you've "moved". That is why you'll want to display the transponder signal strength for the locals before going to the trouble of telling the satellite service provider you are "moving".
If the signals from your desired city are marginal, you can go to a larger-than-standard dish to get them more reliably. I can see spot beams from over 400 miles away using a 90-cm dish.