Believe it or not, SmithP is correct. Originally the scale went to 100 before the more powerful satellites were launched. When E*5 and 6 were made operational, in many areas the signal would show as 100 and no further peaking was possible. Instead of resacling the dish signal screen an causing customers to call Dish asking why their signal strength got worse (when it was just a rescaling and the actual signal wouldn't have changed), dish just added another 25 points to the scale. As Ripley would say, "Bileive it or not."
See ya
Tony