Try 154.935 for State Patrol District 3. They have 7 towers scattered throughout the region with the closest being near the village of Shirley south of DePere. They also have simplex frequencies in use on 151.460, 151.280 and 151.370. You may need a good outdoor antenna to receive the simplex transmissions. For more data, click on the 'Database' at the top of this page and then click on Wisconsin. The next page will have agency menus at the top and a county by county click list below that.
When we are in the area seasonally, with our receiving capabilities here, we can monitor most everything on VHF hi-band from Iron Mountain, Michigan to Dane County (Madison) and from Portage and Wood County to our west over to the Lakeshore including Door, Kewaunee and Manitowoc Counties. We can receive Fond du Lac County Sheriff here 78 miles away on a handheld due to the large, obstruction free area over Lake Winnebago and the Fox River.
Click on Brown County from the click list and go to the bottom of the page for 'Business' listings if you are interested in that sort of thing.