Let's start with the basics.
Researchers think that the R0 for COVID-19 is between 2 and 3. This means that one person can infect two to three other people. It also means 50% to 67% of the population would need to be resistant before herd immunity kicks in and the infection rates start to go down....
That '50-67%' number is NOT what you're hearing from the TeeeeeeeeVeeeeeee yutzes, of course, because all they do is take dictation from 'health' officials who really, really, really want to stick you with mRNA.
What is Wisconsin's situation?
In addition, about 42% of Wisconsin residents have obtained 'at least one' dose of vaccine. Let's assume that those with one dose will obtain the second dose (if required). Let's further assume that complete vaccination means immunity. (Yes, I know--it doesn't, according to a Yale Med School prof.)
Given those assumptions, Wisconsin is now at 52% 'immune,' or the lower bound of 'herd immunity' as defined above.
Not bad at all.