Always remember the planes your trying to hear have their antennas up at 20,000' or higher. I see people in northern New Jersey are receiving aircraft on Dovers Command Post frequency. You are not going to hear the ground side but you will hear the planes. You are only about 100 miles from Andrews AFB. I am over 100 miles from MacDill AFB and hear planes calling their Command Post everyday. When listening to Military Aircraft you should be hearing stuff over 100 miles from your QTH.
You should be able to pick up much military air traffic if you listen to the UHF Center Frequencies. Anything flying out of the DC area, McGuire AFB, Dover AFB, Willow Grove NAS, Lakehurst NAS you should be able to hear when they switch to a center frequency. Any type of decent scanner antenna will work.