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What is an Ultrasonic transducer?
And where can I get one. I think the thing Fred suggested might work. I looked in the back yard yesterday and I may be able to put in on the back side of my fence and point it toward her house. This would cover the whole yard, and the machine (what ever it is) will still be in my yard. I intentionally put my fence two feet in from my back property line. It is very bushy and grown up behind the fence as we back up to a 400 acre hay farm. The overgrowth covers about ten feet past the fence before it goes to the clearing. I could hide this thing in there, I think.
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