Yes KVMX is the local 92.1. Keep in mind this thread is speculation and the station in question could be one of several facilities. 92.1 is a rimshot licensed to Placerville, east of Sacramento but it’s transmitter is 3,000’ above the valley so (car) reception around Sacramento is quite good. That being said it’s only 6kw about 45 miles from downtown, so you still need a good antenna.