I am curious to know if there is a minimum range to pick up ADBS signals?
Reason I ask is, I track planes coming in on final approach almost directly over my house. Once they get with in about 2-3 miles of my receiver, Skyview stops tracking it showing no more messages. Same for departures and once they are about 5 miles or so away, it pops up on Skyview. Interestingly I have line of sight to the A/C during this time but seems they are too close receive messages or something. Generally these planes are passing by between 1500-2500 AGL and my antenna has a clear shot of them coming in or taking off.