I believe Raven Sky Sports is no longer in business at N463 County Rd N in Whitewater WI.
The Whitewater Hang Gliding Club is the only operating entity at that address equipped to offer Discovery Tandem and hang gliding instruction with Certified Instructors. They operate 7 days per week, April through October. There is no waiting (weather permitting) 920-350-2376. Their web site is whitewaterhanggliding (dot) com. Hang gliding is so much fun that it would be a shame for anyone to miss the experience when you're ready for it.
Cons: Does not operate at address shown - lists non-existant club members