There's only about 1.5 db difference in gain at VHF-lo between the 7080p and the 7084P - in fact Winegard's own numbers show the 7084p as being marginally worse than the 7082p for channel 2. And the VHF stations are close. But if you are going to buy a new antenna then it's probably a good idea to get one of the larger ones.
Correct, I edited my post to agree with you.