bird identification

[Noahs helper]

Would like to see if you all could help me in identifying a bird that periodically appears in my yard (this year for the first time). I have checked my southeastern bird field guide, but no luck. Comparing the body structure to the guide, I feel pretty sure it's some type of hawk. And just before it lands, the feeder birds all take off like bullets, even the mourning doves move faster than I ever thought them capible! It flies in, sits on the fence or in a tree for 10 seconds, then flies off. It is approx 14" tall, with solid, medium brown, head back and wings. I have never been able to view the front side of it, only the backside. And I very vaugely remember...some marking...yellowish...maybe...on the head...or... neck. I personally have only seen it twice and did not get a chance to really check it out. Does anyone know what it may be? Would appreciate any info you have to offer.
Jan