[GroundUrMast]

If you want to include WPVI in the line up, you'll need to use an all channel antenna. Both the ANT-751 and the HD769XP series lack support for real channels 2 through 6. An outdoor mounted Winegard HD7082P or 7084 would not be overkill. If you're given no other choice than in the attic, then an Antennacraft C490 or larger would be my choice, it can be re-folded if you need to get it out of the attic in the future.

To get coax from the attic to the existing distribution point, you may need to run on the outside of the building. Simply run through the attic to a point above the existing distribution point, drill a 3/8" hole from the outside into the attic, then run the coax down along the trim to minimize the visual impact. The big box home centers stock fastener clips that are sized for coax.