A few days ago I put up a 1090 MHz antenna to use instead of continuing to use my two meter J-pole for PiAware. Since then I’ve noticed every once in a while I’ll pick up a bunch of planes sitting on the ground at the airport just over twenty miles away. They’re there for a few minutes, then they disappear. Is this normal behavior?
I tried searching here but just kept getting results about electrical grounding and ground planes!