PiDAR

Now not just you Cooper. I had the same artifacts on my screen as well. Maybe it was multi-path interference off the blades. :D

Someone else used a drone a while back. They had the same results. In that situation, they figured it was the electric noise of the motors that was causing the issue. I would tend to agree with that. Also it appeared that when they were in front of the van, they were getting signals. I suspect that the van was acting as a reflector. They dropped off when they hit 300 + feet, but if you looked at the screen, they were really dead before that. After a fixed amount of time with no new packets, the entries drop off the Dump1090 list. If you notice the message counts had long stopped on the assent. One thing you can do to tune your stock antenna is cut it down to a 1/4 for 1090 mhz. (68 mm) . That should improve things some. I've experimented with a lot of different designs for ADS-B antennas. The coax - co-linear has shown to be the best, However, pretty much anything mounted high, in the ball park, does well. The biggest factor is the loss from long coax runs.