Clay,
I hear ya! We have 2 pair of nesting red tail hawks in our yard, along with possums, skunks, BEAR, snakes, raccoon (having a pond on the property definately doesnt help!) - so I'm right there with you.
our girls just cannot free range as freely as we (or they) would like, so a few hours each moring and night (or more if I'm able) they get to come out with me in tow with my "shepards staff"
keeping the herd in check. Funny to watch their little legs and behinds run like mad!
I'd say if you plan on ranging them on all 10 acres - you're going to have quite few birds missing in the long run. There are a ton of ways to keep them free ranging, but safe - the key is to keep the predators out. You can use a corral method using PVC and a mesh wire type of system with a cover (also mesh wire) soas to keep the predatory birds out - and then run hardwire about 2 feet out all the way around the bottom edges to keep dogs, raccoons, etc from digging in. However- PVC is very light so something can push it unless you weight it down first or something to that affect. Then there's always the standard 2X4 or 4X4 fencing posts and chicken wire - so long as you have something else covering because raccoons and other things can break right through anything like that (those pesky little hands go through a 1" wire opening).
it all depends really on what it is you're looking to do and how much time you're willing to commit. I know just having 6 birds, we didnt think it was going to be as much work as it is, but its just like having another dog really. When you go on vacation or away for the weekend, we have to get someone to come out and take care of the girls, water, food, get eggs, etc - something alot of people dont take into account.
HEY - those are nice - I like the first one too!