Here's a news video that shows 2 breif clips of a Siratone 812 in Ripon, WI doing alert. It shows it briefly at the beginning and then again at 2:29. I do know that Ripon at least has 2 612s and a Whelen Vortex but I don't know if the 812 is still there. It may not even be in Ripon, it may just be stock fottage of an 812 that the station had but I figured since Ripon has 612s they may have 812 too. Also it's such a rare siren.
http://www.youtube.com/watch?v=-laYVD0pHTQ