100 miles is nothing. There is one of the Queen's favorite viewers in California that can do 200 miles with ease.
Seriously, the average terrain elevation in the area of the Maljamar is somewhat flat and approximately 4,000 AMSL and the Maljamar repeater site appears to be sitting at the 4,121 ft level. With the curvature of this great planet and the fact that the propagation of the UHF signal essentially requires a " Line-of -Sight", I highly doubt that the area of coverage footprint is anywhere near a hundred miles.
You would essentially, need a site approx. 10-13K in elevation above the average elevation of 4K to have the range of 100 miles with an UHF signal. Even a microwave control path, peak to peak would have difficulties in making it that distance because of the earth curvature.
In this case, the 100 mile range of this site is very arbitrary.