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Is it true that silent bird scarers are difficult to set-up?

April 26, 2017bird difficult scarers set-up Silent

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Is it true that silent bird scarers are difficult to set-up?

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The high frequency sound is projected forwards from the speaker, much like a light beam from a torch, and the bird must be in that imaginary light beam to be affected. So if the bird is behind, to the side, underneath or sat on the device, it will not be affected.