I feel for you as I too am having problems with hawks this year. Having a covered run or tractor for them is a must until it or they decide to move on. Even then, I wouldn't trust my birds out unless I was right there with them at all times. You said you just moved into this house? Find out why they are hanging around. Did the last owner feed them? Sounds stupid and also is against the law but it happens. Did they also have chickens and just let the raptors take them? This bird, from what you described isn't afraid of humans. It should be or at least wary enough to not want to be close to humans. Something is up with that and I would be contacting the Game Dept. for your area and let them know. Also tell them you cannot allow the loses to go on. You obviously have these birds for a reason, be it food, eggs, whatever, you also have rights under the same laws that protect the raptors. If you have taken every oppurtunity available to protect your birds and can prove this, they can and usually will remove the bird from the area. Wind chimes, old CD's hung from trees so they will flash with reflected light, pointing at the bird so it knows you are watching, sometimes help. Truthfully though, it sounds to me like something is/has gone on there to make this bird act this way.
Sorry I can't be more help.
Sorry didnt mean to hijack the thread-- I wasnt the original OP (what does OP stand for?) just chiming in about a similar situation at my house, although we did just move here over the summer..Havent lost any to any predators, but heard that it is best if the Hawks dont learn to eat your chickens (prevention is best for sure) and am very happy to have bloodlessly dissuaded it...