UPDATE!!!
The updated Sprint coverage map indicates LTE coverage around Blacksburg, Christiansburg, and Roanoke, VA, as well as LTE roaming with newer phones, presumably on US Cellular.
A service representative at the Sprint store (run by inPhase) told me they're installing tri-band equipment. The NTELOS days are gone, long live the Shentel/Sprint Alliance!
Also this would be a good time to lock in unlimited data on one of those framily plans.