Houston residents have been asking what’s the purpose of this mysterious structure at the top of Mount Harry Davis after a localresident posted this photo on social media earlier this month. This federal government installation is a type of radio navigation aid foraircraft called VHF omnidirectional range. It was originally installed by Transport Canada around 1980 and now belongs to Nav Canada.Planes can be frequently seen making sharp turns at roughly this point. (Derek Kronemeyer photo)