house with alarm system sign
Photo: Lana Sundman/Alamy
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1. Advertise Your Alarm

Criminals talk big, but when push comes to shove, they won't go near a house that has an alarm, says Dr. Paul Cromwell, a criminology professor at the University of South Florida Polytechnic. You don't even need an active system, just a sign in your yard or a decal in a window—or better, both.
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