Tom, the tower is just a small one, It started out as a 33ft when I took it down. The bottom legs were pretty tweeked. I rebuilt it as a 27 ft tower. It was free with the exception of the labor.
The silo in the background is 80 ft tall with a 30 ft diameter foot print. It definately blocks any useful north winds from the tiny tower I just put up. There is another one to the right which is 45 ft and 17ft in dia. Still working on some VAWT ideas for the little one.
Have Fun
Windstuff Ed