All depends. You usually only can acquire land by "adverse possession" if you are there in open and notorious (so anyone can see it -- and you were) possession under a claim of right (as if you had reason to believe you had the right to be there and keep the land, perhaps because you were watching the othert property for the owner, and he said I want you there and if you look out for mthe rest of the land, this land will be yours). A tenant under a lease doesn't het to keep the house after paying rent for 25 years, for example.
But ask a Wisconsin lawyer what your state's rules are and how they apply to your exact situation. It's worth a shot as you may have a claim. I don't know Wisconsin law as I'm from MO.
