While Gray Hawk are usually secretive, I have seen them perching in the open and on power lines many times in birding SE Arizona since the early 90's.
As a general rule, Gray Hawks are fairly secretive and rarely perch out in plain view in my experience. They are also quite vocal. If this was indeed a Gray Hawk and still in the area, it might respond to playback. I donít normally advocate use of playback, but in this case we arenít talking about a territorial/breeding bird.