Haybale blinds
 

Now that I've got my deer for the year, I've been thinking about making a haybale blind. I've seen some pics of some and I would think they'd work. Has anyone used 1 of these? and if so, what are the positives and negatives?

Has anyone ever made 1? I'm not sure how to get started. Materials for the frame and what-not. Any pointers??