I requested the day off and may take it anyway if I have to. Pine Bush is a small town, a bump in the road that became UFO famous after the Hudson Valley Wave. As I've said ad nauseum, you really would have to take a look yourself at the terrain. It's the obvious answer that isn't obvious is YouTube videos or TV.
See the triangle pointed West? On I84 that's the Kent area and it sits on a 985' elevation at the edge of a big bowl, the river valley. The big rectangle is now SWF Stewart International Airport. It has been an Air National Guard base, or some variant, since 1983. They moved in right about the time the reports about UFOs started.
105th Airlift Wing - Wikipedia
When you are on the edge of that elevation looking across a broad valley you can easily see the base. Sometimes when those big mofo planes are doing their thing they will be very low, sometimes they'll just cruise over that lip. I think that's where a lot of reports came from. Seen it myself a number of times.
The three Xs are the approximate locations of the small strips that the ultralights took off from. The ones I saw came from Sky Acres, the one on the far right. You can go there now for a nice breakfast in their cantina and go home with as much high octane self serve aviation fuel as you think you need. The one in the middle/bottom is the one Phil Imbrogno showed up at to bother the pilots. It's a big open flea market all the time now that we like to go to to rummage through junque.
Pine Bush is over there on the left and if the map were big enough you'd see the other edge of the 'bowl. They're out there in cow country and the traffic in and out of SWF and the ANG base probably has a lot to do with weird sightings. Also God help me, there was a for-real blimp company operating over there within the last 10 years - sightings near Florida NY. Also this is near where those idiot kids let loose a bunch of road flares tied to balloons not to long ago which resulted in a lot of egg on the faces of talking head experts saying 'it came from the sky'
Indian Point usually pops up in this story too, it's not even on the map. Much lower in elevation south of there through a hilly windy stretch down to the river. Quite densely populated down there so low flying water slurping UFOs that come to do battle with plant security guards should have been observed by a hell of a lot more people than claim.