(Hillsboro #2) in Jefferson County Fairgrounds in Hillsboro, Jefferson County, MO. Old Hwy 21 N. 0.7 miles from jct with Main St. W. on North Dr. 0.1 miles, N. on fairgrounds road 300’ to the tower. (4-22-09, N38 14.611 W90 33.684) Photos by Jack Schmidt.