In October 1940 a suspicious fire broke out in the WLWO tuning house, which led to an increase in security, and in early 1941 it was reported that "Today you would have little chance of getting close enough to the equipment to do any damage, for out at Mason, Ohio, where the transmitters of WLW and WLWO are located, a special guardhouse seventy-five feet (23 meters) high has been built, a high metal fence encloses the grounds which are patrolled by a staff of twelve guards twenty-four hours out of each day, and a battery of floodlights illuminates every foot of the grounds day and night."