Dear Always,
The exposure level is irrelevant. Teach the kids the Mishna in Avos: the table that we teach Torah on, has more influence than the desk in the Oval Office. Any true Torah scholar is a positive influence on his surroundings. How many presidents can say that? Or billionaires? If he likes the radio tell him not to take it too seriously. The host is more interested in the listeners boosting the show’s ratings, than it’s content.