I've heard that the spot beam can only get as large as 160 miles, in circumference, and that would be less as the beam would be elongated on the west coast.
It really doesn't matter if you are in the spot beam, it all goes by the zip code db they have you in.
I am clearly in the Detroit FSN HD area, but not able to get the HD signal due to the antiquated zip code DB, I hope they adjust that soon
Jimbo