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If you want to try for WPVI anyway, here are a few thoughts.
ADTech is right, the low band noise must be subtracted from the NM value. The FCC assumes 4 db, which is a quiet rural location.
WPVI runs about 9 db more power than the TVFool database shows.
Low band is less effected by foliage than other channels, but you are so close to the limit that you need to plan to get above the trees.
Once above the trees, the NM value also increases due to height. It's + 4.6 db at 50', +10.5 db at 70'.
So, if you consider a 70' tower, the real NM with WPVI's power is +19.5 db. If you add 6 db antenna gain and subtract 4 db extra noise, the net NM is +21.5 db. That should work even in a noisy location.
The correct all channel antenna for WPVI is a HD7084P or HD8200U.
At 70', the NM values for most of the Philly stations becomes reasonable.
Strong FM stations can overload a preamp. The signal strength of the strongest FM station, WXCY-FM at 103.7, is -22.9 DB. That's a concern, but not an insurmountable problem.
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