Baseball historian Marc Okkonen grew up listening to Heilmann's broadcasts and later recalled Heilmann's tendency to drop the letter "r" from the end of words, referring to Hal Newhouser as "Newhousa" and Bob Feller as "Fellah". He also recalled that one of Heilmann's sponsors was a fly spray called Bugaboo; when an outfielder would catch a fly ball, Heilmann would proclaim, "Bugaboo! Another dead fly!" Okkonenen also recalled Heilmann's most memorable line, uttered after outstanding plays, when he would remain silent to emphasize the crowd noise and say, "Listen ... to the voice of baseball."