Hawk in our yard

We have a hawk building a nest in the middle of a maple tree in our front yard.  It's pretty cool.  We saw her (I'm assuming it's a female) collecting sticks the other day from other trees and the ground and bringing them back to the nest.  It was amazing.  She didn't much like us there and a couple times did a fly by pretty close and it seemed like she was trying to scare us off.

We see her regularly and today we got home and she was in a tree next to the driveway making these squak/squeek sounds and I'm pretty sure she was eating something high on the branch.  A couple hours later she was still (or came back) on the same branch just sitting there.  I got the camera and snapped a picture.  If anyone can help identify her it would be a great help.  I'm not so good at that type of thing and I want to learn more about the species since Ada and I are enjoying watching her so much.

I'll try to get some better pictures, but the zoom on our camera (circa 2004) is pretty lousy.  There are definitely some stripes on the underside of the tail.

Thanks in advance for any birders reading who can help!!