iHeartMedia has debuted a sixth FM signal in San Francisco with the launch of 104.1 K281BU. Launching as "Santa 104.1", the new Educational Media Foundation owned translator is being operated by iHeart via its 98.1 KISQ-HD2 San Francisco and is running commercial-free through the holidays. K281BU operates with 80w/389m from the tower of 93.3 KRZZ