I use old beat-up cymbals about 6" from the top of the hanging feeders to keep the squirrels out. They slide right off em' and back to the ground. Kind of funny to watch 'cause they try a few times. Eventually they give up.
Yer an American right? If you don't know what it is....kill it. Preferably with a firearm that's much too big for the target at hand with multiple rounds "just to be sure". Then post up your trophy on FB with the story of bravery and courage about taking out a 6 oz scary ass predator on your property.