Here's a live Realaudio feed of the Cal-Net repeater system in California.
pnm://24.130.53.163/encoder/calnet.rm
You may have to start RealPlayer first and then plug that URL into it to get it going.
Heavy morning and evening use daily, nets are Wednesday night at 8:00pm Pacific (0400 UTC). Other times, it may be quiet for quite a while.
Their website is
http://www.cal-net.org, and their repeaters cover most of California so you're going to hear people spread out over a wide area.