I have a Terk which picks up a digital station on physical channel 40 quite nicely from about 50 miles from the transmitter. It also helps that it is the same general direction of the transmitters for the Minneapolis stations.
I'm able to get KPXM (41.1) from 55125 - their transmitter is 49.2 miles away from me - using a small indoor antenna. I need only a UHF antenna since there are no digital station in VHF in my area.