Sonoma County’s public broadcasting channel is getting a broader reach: thanks to the acquisition of a public tv station in San Mateo. KRCB has announced it will pay 12-million dollars for KCSM-TV, which was in danger of going under and being turned into a commercial enterprise. The purchase is made possible because of KRCB’s deal to sell its own channel for 72-million dollars earlier this year. The new channel will increase the reach of Sonoma County’s public broadcasting station from 3-million to 6-million viewers in the Bay Area.