Right men, I've had a brainwave

Shortly we will be bringing the land Rover home from the works, and in an ideal world we would like it to stay here unmolested, not robbed. We could do all the usual things such as pedal lock, battery isolator etc, etc but they can still pull it on a transporter. This land Rover, although only a series 11A, has strong family ties. It was my Nephews first motor, his pride and joy, it was rebuilt from the chassis up (mostly at my expense I think

as he seemed to spend an awful long time mooching in the parts stores

). Unfortunately he was killed in a boating accident a few years back off the IoW, and this vehicle was then deemed a family treasure never, ever to be parted with.
So, the question is. Is there any sort of sensor that could be secured inside the house or garage that would detect the vehicle through a wall, a sort of powerful metal detector. This could then be wired to the house alarm which would activate if someone removed the vehicle
Good idea, yes

no
