Thanks for the info, Columbine and K9 Soul. Now I don't know what it is for sure; but it is marvelous to see, soaring over the open field behind our house.

Cooper's Hawk is not in my bird guide. the one I have is the Audubon Society Posket Series, Birds of North America, Eastern Region. I did check and Cooper's Hawks do come in this area. K9Soul, The photos on the link are so good!