Lojak is a low power transmitter. Only works "line of sight" to a few specially equipped police cars. Police officer uses a "direction finder" which points to the origin of the transmitter. Signal reflects off buildings so the direction finder gets confused. Advantage to Lojak is the thief does not know it is installed. Onstar thief will just pull a fuse to shut it off.
Modern cars are dang near impossible to steal without a key. Makes more sense to install it on high theft ratio older Accords, Civics, Integra, Saturns and Sentras.
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