If you really want to protect your birds from Hawks then you need to make a serious choice, free range them and except any losses you will have and there will be many, or get smart and secure them in a real overhead protected preditor proof run. Little shinny twisty things and blow up something or others yard ornaments are just a waste of time, because the hawks are much smarter than the folks who try these silly antics. Please protect them the right way or live with having to replace your chickens frequently, those my friend are the facts. I hope things work out whatever you choose.
AL