We're on the westside (Bonny Slope area). I put a Winegard HD7694P antenna in the attic and still have occassionaly artifacts on KOIN (CBS). All other major channels ok (we really only watch the networks and OPB) - don't think I've ever seen a problem on any of them, at least during prime time. The TV Fool profile (attached) tells the story perfectly. Not sure why some other channels on the same tower are ok... maybe something to do with the particular antenna or wavelength (?).
I suspect the intermittent problems are due to scattering from trees. Maybe a higher gain antenna would help? We've got a reasonale amount of space in the attic, though I don't want to put some big ugly thing on the roof.
Any thoughts? Am I missing something?