Can anyone tell me what this spider is
Spiders are garden friends. The poisonous brown recluse is not common to Wisconsin. There is a species of black widow, but that is not what you have. Here is a publication specific to Wisconsin with some common spider species in your area. http://labs.russell.wisc.edu/insectid/category/spiders/
But that still does not help me in identifying which one it is as it looks like several of the ones listed.
The best way to get a positive identification is to bring one or more into the local Extension office. https://fonddulac.extension.wisc.edu/hort/master-gardener-help-line/ They are much easier to identify alive, and it's best to bring it in soon after it is captured.