 O'Hehir was accepted and was asked, along with five others, to do a five-minute microphone test for a National Football League game between Wexford and Louth.His microphone test impressed the director of broadcasting so much that he was invited to commentate on the whole of the second half of the match.Two months later in August 1938 O'Hehir made his first broadcast - the All-Ireland football semi-final between Monaghan and Galway.