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The NYC stations are closer and stronger than the Philadelphia stations. If you can live with just the NYC stations, then you can do without the antenna rotator.
If you want both NYC and Philly stations (and perhaps a few other stations in other directions), then an antenna rotator is needed. An omni antenna won't work for the Philly stations because they are too weak (antenna directionality and antenna gain go hand-in-hand; omni antennas have pretty low intrinsic gain and cannot pick up weaker stations).
On the subject of combining antennas. If you have separate UHF and VHF antennas, the proper way to combine them is to use a diplexer like the Pico Macom UVSJ. These are inexpensive frequency selective combiners/splitters that will make sure that the UHF and VHF signals from each antenna do not interfere with each other.
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