I had the same thing going on with the hawk(s) over the last few weeks. Hawk was around and very close and they were loudly sounding the alarm and keeping from getting nabbed.
However...I think that the more it observed, the better opportunity it had to see their movements and behavior and be able to strike where it counted. I was thinking they were doing well but I probably just gave it more time to figure them out.
I just want to change things up a bit to make things a little less predictable.
Cooper's Hawks do, and they are good at it. I pasture my flock in a dense sumac thicket, and I lost three birds last year to a Coopers, plus had a number of close calls. (I ran him off hens while he made dives several times.) He got one of his kills inside their house.
What worked for me was:
-Roosters. The birds killed were being kept separately from two very brave and hawk aware dudes. This year, I ran my broodies and babes with the big kids from the beginning, no losses. Hawks fly over us nearly every day now to hunt in the fields nearby, but the boys always notice and the flock spends their days under foliage. None lingers to scope out my birds. (fingers crossed)
-A bobble headed fake owl. I mounted it on a 20' sumac pole and tied it to a different fence post every day with bailing twine. Moving it frequently is key. The instructions say to move it every three days, but I think more than that is necessary if the hawk is already paying attention. I alsi think it's important for the owl to be up high, and for the bobble headedness to be activated either by a slightly crooked mount, or a pole that is thin enough to sway a bit in the breeze. It looks extra convincing when the head is moving a bit. I was very hesitant to get one because I thought the chickens would be in a constant state of panic with a fake raptor nearby, but they seem not to care. I also thought that the hawk would be smart enough to figure out that if the chickens weren't scared, it probly wasn't scary, but he wasn't. The $30 bobble headed one is key, the $5 inflatable one does not work.
-Crows. They were the ones to escorted the hawk off the property permanently. I expect them to call in gastly favor at some point. It will be worth it.
-Not having chicks in the fall. The hawk started paying attention to the babies and then got brave enough to try for adult birds. No late babies this year- much less hawk attention. It's a bummer for me bc I have an excellent momma who usually goes broody in August, and I love having puffs all the year round.
What didn't work for me:
-Bird netting
Dude got in under it. So enraging.
That said, Red Tails are pretty different in their habits and more easily deterred, ime. Coopers are kindv thicket specialists, Red Tails focus on open fields. RT are not good technical flyers, they tend to soar up high in the open to search for prey then dive down quickly. I had my birds in a more open spot that was heavily trafficked by Red Tails and never once lost a bird there. I made a spiderweb grid of masonry twine overhead. Gaps were big. I think 3". Lots of Red Tails pass by where the birds are now, none has ever stopped. If you have a Red Tail, you might put up a web and get a bobblehead and be fine.