David McCullough does not hesitate to climb his internet towers to keep them functioning in peak condition. Photo by Hill Country Wireless. Owners of Hill Country Wireless and Technology, David and Ginger McCullough, Johnson City are working to reach parts of the Hill Country previously having no or poor internet service. A new tower, which was delivered last week, is in preparation to be set up on the hill behind Cox Paving in Blanco to extend the company’s service area. The McCullough’s moved to Johnson City from the Texas Panhandle where they had a cattle ranch.