Doesn't Kingman get most of their broadcasts from Vegas? Reason being, You may be too far to recieve the H.D. signal on your air antenna. I had this problem last year up here. We were told we were too far from Sacramento to recieve the H.D. signal. Things may have changed since last year, but worth looking into. BTW, High Def is great. It's like watching DVD's all the time.
Chris