Of course, the ratings have nothing to do with who owns the station, what programming they choose to put on the station, how many stations a business can own in a single market, what major conglomerate owns how many stations - in how many markets - with the same shows put on in those markets, which of course produces the numbers, etc., etc., etc.
It has nothing to do with groups like the FCC who have for a few years now been lead by known conservative entities and people who have opened the door for this kind of ownership and radio control of markets and major stations, etc.
Radio is a bit of a different egg when it comes to media assessment. It can easily be controlled and dominated by a message and theme, and it's now easier than ever thanks to conservative efforts of the past few years. Considering that the radio airwaves are supposedly public interest and free to listen to, some guidance and oversight should be in place, IMO, to prevent one theme dominating another. It's not like newspapers, who are completely at the mercy of subscribers, which are the only real measure of success.