Hearing milcom almost requires a good outdoor antenna (a discone, ScanTenna, one of the DPD ones...) unless you are lucky enough to be close to an air route or mil base.
There are many possibilities, and all of these are pulled from our wiki and database. Unfortunately some of this info is a little dated, as we lost the ability for the public to see the FLIPs where all this info was stored last year. But much of this should still be good.
For the first link - ignore the FAA data as it's frequently out of date.
New York (ZNY) Air Route Traffic Control Center (ARTCC) Scanner Frequencies and Radio Frequency Reference ZNY
McGuire AFB - The RadioReference Wiki
NorthEast AAR Tracks - The RadioReference Wiki
NJ ANG 177th Fighter Wing - The RadioReference Wiki
ECNA AAR Tracks - The RadioReference Wiki
AR777 AAR Track - The RadioReference Wiki
Basically what you would be looking for would be offshore flights doing exercises, or flights coming out of places like McGuire going North to work in the MOAs.
You might also want to scan the milcom blog at MT as Larry frequently publishes updates to frequencies you don't see anywhere else.
73 Mike
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