I lose about 3-4 chickens each year due to hawks. I free range and unfortunately, we have tried everything mentioned and nothing will keep the hawk away especially if they know they have a food source. I actually put water and small amount of food daily in the covering woods where my chickens hide. Once no sign of a hawk, they feel confident and begin to free range without fear, but when once gets hit, they hide again for a week or so. We won't kill them, just can't do that, but they are not afraid of us or guns. We have shot and hit a tree branch with the hawk on it, it sat there. No fear of us. We came home from a dinner out and starting driving down our long driveway and as we got closer to the house area, we saw a hawk on top of one of our chickens. My husband literally got out of the car, mind you the hawk and my dead chicken about 15 feet away, he walks right up behind it and swoops it up. We put the hawk into a large dog carrier and drive on our ATV about 50 acres into our property and set it free.....Of course, it came back. We have learned that we will lose a few birds each year and we do everything we can to avoid it. We are home all day and are always watching the sky. We have also trained our Jack Russell to spot the hawk, she is a better sky watcher than us. She has saved many of our chickens by chasing the hawk. I'm afraid one day this hawk will turn and take my dog next......Just part of nature....