I recall a unit from the late 80's called the Skybuster from Fuzzbuster, but can't seem to find any information on it. Google only returns one hit, that only briefly mentions.
Skybuster was supposed to detect low flying aircraft running parallel to the road, as in a Police Air Patrol. I have no idea how it worked, but maybe it detected the transponder. I have no idea how well, or even if it worked. I suppose not all that well, since it wasn't on the market very long.
If anyone has any information on the Skybuster, or can direct me to information on it, I'd greatly appreciate it.
[I updated the title for this thread to reflect the correct spelling of the unit.]