If the pic I tried to post comes through it isn't that helpful anyway - I need a better pic. I put posts up scattered throughout the enclosure (you could use long metal garden stakes) and strung wire back and forth across the area I wanted to cover with deer netting (so the netting could rest on it and not sag too much and to provide places to tie the netting to along the way). Since your hawk will return soon for another meal, maybe it will be less daunting and fairly quick to do a smaller area first, and confine them to that area till you're able to add to it (you can perhaps use temporary plastic mesh fencing to section off an area). The long metal garden stakes can serve 2 purposes in this instance - something to attach the vertical fencing to as well as the overhead deer netting. I hope this makes some kind of sense in words - good pics would be better!
JJ
I fear it would be a deal to cover that much area, and the problem you would have is all the leaves and trash from all the trees riding it down. I believe I would try criss crossing wire or heavy string in a tight enough grid pattern to thwart hawk but let the tree thrash to fall through. I have heard that a rather loose pattern will keep them at bay, even though they could get through. Are you sure you couldn't teach that goose to be a hawk nipper?
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Not sure of how tall you fencing is, but maybe you could drape the netting over their house to help hold it up in the middle. We put up posts in the middle of ours and used PCV piping to connect from one to another down the middle of the length of run to help hold it up. I then secured it all around the borders with small electrical zip ties to the fencing. I feel pretty secure about it now. No flying bird will be able to get to the girls now. They are all locked up tight at night, so that's not a problem. They only free range during the day if I'm home and out with them. Our run is 25' x 50'. Better safe than sorry.
CD's/DVD's in large areas or low fencing can be mounted on poles (screw one end of a spring from old ballpoint pens into wood post or glue on an old garden pole) then slip cd/dvd over spring and glue/caulk in place. Mount flat as illustrated in following thread: