How far away from broadcast towers will you be able to receive mobile DTV?


Are there any reports or tests that give any kind of indication of how far away someone can receive atsc m/h? Will there be chance for extreme circumstances where a DX'r can receive signals from 100+ miles away? I realize that it depends on other factors too like terrain and LOS but I'm wondering if there's a general "up to 20 miles" like regular ATSC signals seems to be.