mms://70.173.176.204:5150
I have that up, but I can't handle a bazillion people connecting so... I'm not monitoring any specific talkgroup since they're spread across several, so I'm just piping out the feed off the 246T as it picks up whatever's going on.
Use Windows Media Player to listen in... if it overloads obviously the connection will choke, I'm on a 512 Kbps upload and currently the stream is set for about 37 Kbps so, a few people can hop on.