 WTYM began broadcasting in 1949 as WACB, with the call letters standing for Armstrong County Broadcasting, the name of the original licensee, headed by its president, Lawrence Henry; and vice president Joseph B. Moore.WACB was the second radio station to come on the air in Armstrong County.The first was WAVL in nearby Apollo the year before; and the third was WKIN, which came on the air later in 1949 at 1600 kHz, but that station would later fail and its license returned to the FCC.