From my understanding Shentel has always been very responsive to trends in the industry and from what I hear their relationship with Sprint has been very lucrative, they paid the upfront cost of installing the towers in their service area (Shenandoah Valley, WV, MD) mostly rural areas with their own already existing fiber and in return they get to be the only guys selling Sprint products. I believe they have roaming agreements with VZW as well and their coverage is top notch. It only makes sense for them to keep investing on that network.