Being that you where so nice as to point out a differet site, here are two from here, I belive the OP was asking for help on what he or she could do on there own with out help of a internet feed.You can visit a scanner feed for Snohomish County. Not sure about Pierce.
Snohomish County Scanner | LIVE Police, Fire and EMS radio communications in Snohomish County
Depends on exact two points (signal origination and your reception location). But the basic idea is correct - the scanner can really only hear what its antenna "sees".I'd build a huge tower with a tower top amplifier to be able to listen to radio signals that aren't designed to be received in your bedroom.