Were you able to determine if the tube was hollow, and if so, how far down did it go? It may be a breather tube for an underground facility and the array looks like a 800 mhz antenna which was used for cellular reception about 15 years ago.
A rather eccentric friend of mine purchased a former underground facility in the mountains of West Virginia in 2008. It was a nuclear proof underground facility built by AT&T to keep communications going should the U.S. take a nuclear hit.
The facility has 36" thick doors throughout and a 36,000 KW generator and is about 6000 square feet in total size. It came with about 300 acres and he is quite pleased with this rather unique purchase.