Between 2011 and 2016, this site monitored the City of Santa Clara SmartNet radio system (police, fire, etc.) and then later the new Santa Clara County SVRCS multi-agency radio system. It is currently idle. No new calls are being recorded, but you can listen to several years of history.
Weird and interesting things that happened on the old Santa Clara radio system (recordings from 2011 to 2014).
Learn about how Software Defined Radio (SDR) made this all work.
Santa Clara County's multi-agency system (recordings from 2014 to 2016).