Two points:
As
@Ryan Williams has already pointed out, until Cumulus and Nielsen works out their legal differences in court,
all of Cumulus' stations will appear to "not manage to get a rating". If the OP had done any amount of research -- or even read other threads on RD about the court battle, he would have known that. Therefore, it is obvious to me that not only is the OP not in the business, he was simply looking for an excuse to bash KNBR. (His follow-up comment makes that obvious.)
Second, sports-formatted stations do not live or die by the ratings anyway. Agency buys for advertising on these stations, in all the major markets, are based on the fact that listeners to sports radio are fairly loyal, and listen for longer periods of time than the average. Certain advertisers want that audience and know they will get results, regardless of the Nielsen numbers.
Perhaps after he has been here more than a couple of weeks and expanded on his whopping six post total, he will understand better. At least, I hope so.