you said you had a large antenna from the analog days, which should still work. A lot of your stations went from VHF to UHF when they went digital.
You may have too much loss between your antenna and your TV/Converter box to pull in UHF from NYCity.
One is to be sure your antenna is pointed at NYC since currently you don't have a rotor and will need one if you want to turn and point at Philly, as it's farther away and weaker. Where you might have needed to point at stations before with digital everything has to be perfect in a TV system.
If the coax and balun at the antenna is over 10 to 15 years old you probably want to replace it with good quality RG6 coax. And buy a new balun (the thing that hooks the coax to antenna screw terminals.
Then being sure you are pointed at NYC do a new channel scan and see what comes in.
If that doesn't help, try adding a
Winegard AP8700 Chromstar 2000 Series VHF/UHF Pre Amplifier (AP-8700) | AP-8700 [Winegard] and leave it in the factory position of Fixed Trap In.
It's a two part system. One part needs to go up right below the antenna, so you need access to the antenna (you also do to change the coax and balun).
If you want Philly stations according to TVFool, you need to be able to turn the antenna.