This weekend, while I was standing right at the flight line with four planes flying, the checker was saying there were many more active channels. Really there were no more than the four, but the instructions caution you that with multiple active channels, at very close range, or inside a metal building...strange and quite possibly incorrect indications may occur. I guess for 50 bucks we cant expect too much. Overall, understanding its limitations, I still think it is a handy little gadget.
Jim