I agree with ocrenter. Just buy a couple of signs and stickers. The typical burgler won’t mess with you.

My property has signs like these:
http://cgi.ebay.com/Security-SignS-w-6-window-decals-adtl-options_W0QQitemZ290332301887QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4399275a3f&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1205%7C293%3A1%7C294%3A50

Even my neighbors don’t know.