Strange ADS-B Activity

#1
With one of my ADS-B setups that I have limited to as close to a 50NM mile range in order to avoid picking up "most" of the traffic for JFK, EWR and LGA, this morning I noticed some strange activity in the last 24 hour period.

A few spikes close to and beyond the 450NM maximum range were recorded. My logging program however did not have the ICAO registrations since I have it set up to drop after 10 hours or so. But, it could not have plotted this unless the ADS-B frames had Lat/Long as part of them.

Have not seen this ever (in the last 6 months of active monitoring).

Any ideas?

Thoughts:
  • Meteor scatter
  • Reflection from another object
  • False reporting
  • Pilot playing games
  • Something else
Image: Shows normal range configured for 50NM coverage based on antenna pattern and gain.

Image: Zoomed out to show abnormal spikes that are explainable based on 450NM or so earth curvature limits for LOS.



Image: Shows normal range configured for 50NM coverage based on antenna pattern and gain.




Image: Maximum zoom. No way should any plots as far as Europe or Louisiana show up from New York.