I'm not sure if this news is old or not, but I didn't see any other recent thread concerning it. This month appears to be the first non-holiday month that KGO has not been overall bragging-rights #1.
http://www.radio-info.com/site/markets/grid/san-francisco
(At least I believe that's 6+. It doesn't really say.)
http://www.radio-info.com/site/markets/grid/san-francisco
(At least I believe that's 6+. It doesn't really say.)