Sandusky Star-Journal, April 15, 1920, page 4:

    DAYTON April 15--The radio department at McCook field has adopted a plan for regular weekly concerts by wireless telephone to be held each Friday evening. The wireless men at the air service post have installed special equipment with a carrying radius of more than 100 miles and all stations within that distance reported they "listened in" on the initial tests As a further radio experiment, an aviator equipped with a wireless telephone set will soar to a dizzy height Saturday morning and converse with a crowd of people in the downtown business section just to show what can be done. Special instruments are being set up for the demonstration.