I've read on another forum that this little thing can be used to detect the presence of low flying aircraft in your vicinity. Such as police helicopters or planes flying at a low and steady altitude.
I am wondering if anyone on here has tried on of these in conjuction with a radar detector.
Apparantly it even picks up an aircraft's squawk codes so if one was in the know, he/she would be able to tell which code might be the police. And there is even a model that will tell what direction the nearby aircraft is in relation to you.