I've seen this kind of location in the Bay Area before and even though the report shows adequate signals, multipath overwhelms the direct path signals and makes reception impossible. Go ahead with your 4V plan and see what happens. If you receive little or nothing then it's hopeless. If you're missing just a couple of stations then an antenna upgrade might do the trick.One question: is there an "affordable" coax antenna signal meter anyone could recommend? In case I need to up to a directional antenna it would definitely make placement easier than "trial and error" off my Tablo tuner.
A signal meter may not be helpful because it can't distinguish direct path signals from multipath signals.