Here is a jpeg map of Brown County State Park near Nashville, Indiana in EM69vd. KC9ULA and myself, KO0Z) mapped out the vistas which offer a clear view to the horizon. The vistas are along a paved road on a ridge with typical elevations around 1,050 feet (320 meters). I've marked the vista openings to the horizon in degrees so as to better plan where an optimum spot for QSO attempt could take place.
73, de Ron, KO0Z