Hey! I graduated from UW two years ago, but I was in a sorority.
Fraternities
are strong there, but they are different than they are at say, Ole Miss or UGA. It's different up north. They'll all provide a great brotherhood and wonderful opportunities. The fraternity men I know wouldn't have changed it for the world.
For whatever reason, the UW Greek website is down right now, so I would contact the Greek Life adviser with questions. Once the website is back up, it will give you all the information you need regarding Fall Recruitment.
http://kb.wisc.edu/page.php?id=10992
Good luck! Let's go Badgers!