Harrison, Arkansas gets cutting edge phone service

According to the story in the Daily Times, a helium-filled balloon was being used to map the route. The balloon was sent up 50 to 100 feet and held in place with a rope, while surveyors 15 miles away spotted it with high-powered binoculars.

http://harrisondaily.com/news/museum-musings-can-you-hear-me-now-harrison-gets-cutting/article_0a3d1952-562f-11e9-8975-9f14a9d77213.html