Doesn't do any good aganist the guy down the street that crashed one of our planes,Was using a 72 Mhz radio on his car!No idea of problems or any apologies either.Those kind will always be out there.My tracker won't turn on if the frequency is in use!All I get is a busy signal!Also I have a built in scanner already don't have to buy extra one,probably not as good as the real ones but does tell if anything is in the area.