Please correct me if I'm out-of-line!
Patience paid off, he landed on my old fence post on my lawn. Usually he's at the top of the electric light pole. I believe it is an immature male.
His normal hang-out...
IMAGE LINK: https://flic.kr/p/oQjS7x YellowBelliedSapsucker_JuvenileMale?-3626 by sjc from vt, on Flickr
And a close-up...
IMAGE LINK: https://flic.kr/p/p7PSFk YellowBelliedSapsucker_ImmatureMaleCloseUp_WM-4256 by sjc from vt, on Flickr
Partial shade, partial sun equals mediocre images!