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Of course you realize that every time you walk into your back yard at night you're going to wake the neighbors. In my experience a little wind moving branches will also activate the motion sensor. And, a possum, cat or dog might set it off, as well. You might just end up with upset neighbors who would like nothing better than to see you robbed as revenge, in the end. A horn would be more effective in the country.You might be farther ahead by organizing an active Neighborhood Watch and establish a rapport with local authorities. May not be as satisfying as whacking a perp, but legal and effective if you can keep everyone interested with regular meetings and neighborhood events. My 2¢.
Need to set up a video camera along with it. Then we can all see the dirtbag jump out of his skin!