Pilot reports 30ft tall triangular craft above Maryland

I found this posted to one of my favorite aviation YouTube channels.

https://youtu.be/MzipqD6bhvU?si=hsJbGIXczCdcTHo-

Pilot (N30024) reports a 30ft tall triangular craft 10 miles NW of Frederick, MD, USA at 6500ft altitude on 2023-12-20

Any other sightings of this?

This is a credible report IMO as it was made to the federal government by a trained pilot on public airwaves. The plane is a Piper pa-28 owned by an LLC based in DE. You can view the flight history here if you have a flight aware subscription

https://www.flightaware.com/resources/registration/N30024