Not sure what a Preditor rig is. If its much the same as a quick strike rig (with 2 trebles on the same line) then yes, it is legal in WI. I had the same question last year & called the DNR. They said the reguations say 3 lines - not 3 hooks, so good to go. If you're still worried about it, put a bead or blade on it somewhere and call it a lure that you've topped with bait <grin>.