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[Dutchie]

A remote GPS receiver ariel would then give the whole plot away.

It uses the same ariel as your satnav system and i agree those things used to be huge and on top of the car.

The new systems like my Becker use a very small ariel inside the car.
I think the system here works in two ways satnav and gsm for positioning so even if they find the ariel it can use the gsm system to tell where the car is.