What I'm saying is that if you are at 80 degrees west and have no LOS issues, you should be able to get from about 10 degrees west to about 150 degrees west.
I'm at 84 degrees and watch Hispasat (ku-Band) at 30 degrees regularly and haven't really tried any sats further east than that. I watch AMC7 (C-Band) at 137 degrees west fairly regular and have listened to Radio from AMC8 (C-Band) at 139 degrees west. I'm sure I could get 148 west, but have never tried, as it doesn't interest me. I don't think I could get anything beyond 148 west, but I could probably get some other sats on the east side of Hispasat, if I made an effort?