It might help. OTA signals constantly vary in strength. You don't seem to have enough Fade Margin to allow to allow for that; you are right on the edge of the "Digital Cliff."
I found the 1165B in the CM 1990 Catalog, so your antenna must be even older.
The 1165B looks like it has a high gain UHF section. I don't know what the difference is between the 1165A and 1165B.
What preamp are you using?