In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

Hi Zera,

I think you can use a low power AM transmitter to avoid problems with the law.
AM is quite directional with a ferrite antenna, so it may be able to tell you the approximate direction of your car. 
( with some smart shieldings )

Unfortunately, I am not an expert of RF circuit designs.
Hopefully, somebody else with RF circuit experience can help you.

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