I put some out a few years ago. Made them out of cedar. I put them on the edge of ditches that are about 3-4' deep. They are mounted on 2" galvanized pipes that were about 11' long. I chiseled a hole through the ice and stood on my 4 wheeler rack and pounded the pipes in and then mounted the houses with u-bolts and put cedar mulch/chips in them. Actually cleaned them out last week.