Sorry if this has been raised before. I had a very strong KA hit on my STI yesterday, but I wan't able to locate any source; doesn't mean it wasn't there, but I couldn't locate it. However, I've had KA indications at this location before, also without any obvious source. The only idea I have had is that this location is within a mile or two of an international airport.
I always treat KA hits as real, since I hadn't ever heard of them being false. Any ideas??