Very few of the HD radio stations lock enough to listen to HD2 in Burlington. It drops over every little elevation change. Only 100.3 and 99.5's HD2 lock consistently, but a few others are strong enough if you don't mind a few drops. 50 miles of HD radio would be nice! No HD AM here. One of the Richmond VA stations is HD, I noticed while searching for football coverage a few weeks ago, but only for a small area of its analog coverage.
In southern Alamance County, and toward Asheboro, you can get the Greensboro, Raleigh, some Charlotte, and a few of the Roanoke stations to lock HD in certain spots. Just don't move your car once you find a sweet spot. It's quite nice. The same is true for TV, should such things interest you.