Know Before You Go
Can be hard to find. Park entrance is on east side of Rohling Rd between two businesses, with only a small sign to alert you of it's presence.
There's a parking lot on S. Grace St., opposite 475 S. Grace St. There's a large sign for "Fullerton County Forest Preserve" and "Helicopter Field." From Google Maps, it appears that the structure is to the west from the parking lot. Also, off W. Fullerton Ave. is the Addison water storage tank. Taking the road to the tank, turning right just before the tank and then left should lead directly to the tower.