A phone survey of radio listeners in the U.S. this month found that public radio listeners are more satisfied with their stations than the average listener. Research firm Mark Kassof & Co. called 649 radio listeners to ask how satisfied they were with the stations they listened to most (P1 stations, in radio parlance). Forty-eight percent overall said they were 100 percent satisfied with their P1 stations, but 61 percent of public radio listeners reported total satisfaction. That was topped only by Christian radio listeners, 77 percent of whom were completely satisfied.