First Clintonville, now 80 miles away Montello. Here is an audio recording. http://abcnews.go.com/blogs/headlines/2012/03/mysterious-booms-return-to-clintonville-wisconsin/ They say it sounds like it's at the ground surface, or just under the surface. Nothing solid from any of the experts.It rattles windows and houses. Some towns people are leaving for a while because it is disrupting their sleep and scaring their dogs. Weird.