The San Francisco fall 2005 Arbitron radio ratings are out and while perennial leader KGO-AM was first, like usual, it was down from 6.4% to 6.1%. Moving up, however, was KOIT followed by classical KDFC. Ben Fong-Torres, in his monthly Chronicle column on radio, mentions the ratings, too. He also says radio stations have formed an alliance to ensure that all of the stations use the same system to deliver dlgital radio, which will mean clearer sound (no static) and additional channels. Fong-Torres answers other HD radio questions as well.