Well theres a few websites you can get on and contact the owner of them. 2 of them are on Teamspeak and one of them you can use any application to listen to. I'll list them below...
-http://www.scannerbuff.net --> known as SBN, hosts streams on teamspeak
-http://www.incidentbroadcast.com --> known as IBN, hosts streams on teamspeak
-http://www.livescanneraudio.com/ --> hosts various streams
Jason