Thanks for the great analysis and reply, rabbit73 ... and you are correct that I don't need KHIZ. I hadn't paid attention to the noise margin of the stations ... the -7.1 dB for KCBS indicates that it's the one that I periodically lose.
I will try the Winegard HD7698P by itself and compare the signal strength for KCBS with and without the pre-amp.
I plan on mounting the OTA antenna to a roof-mounted 2" rigid conduit (outside diameter 2 3/8"), which also will hold a DirecTV dish. Here's a picture of the pole:
Rigid conduit mounting pole
Since the pole is so big and the mast clamp on the antenna only goes up to 2" OD, I think I need something like these for mounting:
Ronard 8200 vent pipe clamp
Galvanized 1 5/8" pipe
Is this the way to go, or is there a better way to mount the HD7698P?
The satellite dish points to 136°, the antenna will point to 81°. I will have only two to three feet of separation, but since they are so directional and offset by 55°, I'm hoping that I won't have any interference between the dish and the antenna. Does this look OK, or do you think I'll need more separation?