(Lake Williamson) SE of Carlinville, Brushy Mound Township, Macoupin County, IL. IL4 SE 2.4 miles from jct with IL108 on the E. side of Carlinville, S. on Carlinville Lake Rd. 0.45 miles to the tower. (N39 14.812 W89 50.174) Photos 11-14-09.