It works better if you really really want the crop to feed your own livestock rather than have it stolen by deer.
Up the road 2 years ago that was happening, in desperation the farmer who lives off the property a got a bird scarer that worked for a while but really pissed off the neighbors going off at random all night. He was eventually forced to turn it off at night by sleep deprived locals but by then the deer had gotton used to it anyhow.
2 of us shot it one evening, we counted 17 on what was left of the crop and shot 5 before they twigged that the noise wasn't the bird scarer. As we were picking them up the others started wandering back out.
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