I don't believe this has been posted. It is a ATI in Arnold, MO doing Westminster Chimes and voice.
http://www.youtube.com/watch?v=ibd-TJorct0
This is from a news clip...it shows a P15(?) going off and then a ATI going off. The ATI in this clip doesn't seem to ear-piercing.
http://www.youtube.com/watch?v=MOqLBrWtSXc