They are most likely following PPM data when people tend to listen most or not as much. PPM has overall throw out the fact most listening is done in AM drive (not true) and during top of the hour. Most stations again depending on market, but here in Chicago, I seen the most listeners were during 1/2 hour point.
Listen to an aircheck of WLS in the ealry 70s and they were running one commercial stopsets back into the music, many times an hour. Then in the 80s WYTZ would run a few minute stopsets :20 and :50 followed by weather each time. But they had stiff competition at 96.3 and 101.1 and the suburban sticks at the time. Today the competition is the stockholders, so load up as much ads to pay off that debtload and return us a profit!
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