here is a half decent 2way alarm i bought with pager.
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW
says it works 1.25 miles lol it worked 4-5 blocks for me.. and when that alarm goes off here is my next remedy to anti theft:
http://images.gunsamerica.com/upload/976251547-1.jpg