Hope it works! Unfortunately the only sure way I've found to protect chickens from aerial predators is a run with a top. From the look of your nice set-up, it doesn't look like it would be too hard to add one to the front of your coop where the chickens go in and out. I built mine out of 8 ft 4 x 4 posts for the uprights, 2 x 4s for the top, and used turkey wire for the sides. It's 16 x 16 ft in area...lumber comes in 8 foot sections...which gives 16 sq ft of space for 16 birds, 10 sq ft for 25, etc.; I don't know how many you have. Frankly, I put hawks in the same class as vermin and varmints when it comes to poultry.