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Not bad for determination. The install looks clean too. it's too bad this can only work for 97-99 cars with passive remotes.
Theoretically though, if you are standing close enough to the car for the FOB to unlock the doors, your car can be stolen easily.
The C6 approach FOBs can only work from a couple of feet away from the door.
The C5 FOB has a much longer range.
The range is: When using one of the key fob
transmitters supplied with your vehicle, the passive
range distance is as much as 30 feet (9 m) away from the
vehicle on the driver’s side and 20 feet (6 m) away on
the passenger’s side. The active range distance as
much as 100 feet (30 m) away.