In most situations these hawks will work provided the Magpies can see the Hawk profile above them from where they are landing. All you need to do is to install the Hawks high above the areas where the birds are doing the damage or at the edge of your crop. Usually magpies attack the edge of your crop first.
By protecting the edge of the crop you can protect the entire crop.
There are two methods. Refer to the installation page for details. The best method for you is to use strong fishing line or thin wire to suspend the hawk between tall trees, poles etc. You will obtain excellent results using this method.
The Hawk is unique because it is a full size imitation hawk made of durable weatherproof plastic. As birds instinctively fear the Hawk they are also scared to come within sight of the profile of this replica of a hovering Hawk.
From previous customer experience in similar situations we can say that a Hawk Bird Scarer will work for you. If it doesn't, we offer you a money back guarantee.