I estimate the zone of
protection these mechanical deer deterrents provide is around 50 feet.
If you've got a big area to
protect you'll need to install multiple units. I discovered last year
that it helps to vary the noise signatures so each deterrent has its
own unique chime.
At our most vulnerable spot I
adjusted the design a bit to allow for a double bang. This is easily
done by having something hang in the spot where the clanger rebounds to
after its first hit.
After a few weeks of
adjusting you'll begin to learn how to listen for each sound. This is
important because you need to keep an eye on how they keep operating.
We
had a power failure back in the winter and it didn't take the enemy
long to figure out our defenses were down.
