They've been using the bomb range for years. The local media has had announcements for years for Dublin, CA (where I used to live and the bomb range is) " If you hear explosions near Camp Parks (the reserve base where the bomb range is), do not be concerned. It's Mythbusters filming an episode". When they are at a local FD , it is the Livermore-Pleasanton training facility in Pleasanton, the town south of Dublin. I like watching the episodes and trying to figure out where they filmed it locally. The quarry they used to blow up a cement truck was near Auburn, CA, in the Sierra foothills. I figured it out from seeing the FD on the fire truck. the car and truck myths are tested at the runways at the closed Alameda Naval AIr Station.They are based in Hunter's Point , near Candlestick Park.