If this has happened to you, it has no doubt happened to others in your neighborhood. You may need to form a neighborhood watch group, meet with the police, and find the culprits. These are usually crimes of opportunity, not "cased crimes", where strangers to the neighborhood just wander around looking for stuff.
What is so attractive about your car anyway, do you think, and can you eliminate that? Do you leave CDs in plain sight, etc.?
Anyway, I think alarms are useless. They only go off after the window is broken, so now you have a broken window and a $400 useless alarm going off and waking up the neighbors.
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