Re: "...can pick up the signal from keys..."
PS. If I did work in the automotive industry, it'd presumably be Mercedes since that's what I drive (for almost 20 years now). That wouldn't be so embarrassing in this context, since their security is probably pretty good. They make fewer blunders than other brands.
Do they now? Maybe you should do a search on Mercedes keyless car theft. Of course if your particular Merc is 20 years old then you won't have that problem.
I did a search on my make of car and keyless car theft, and couldn't find a single instance. Partly because it isn't a premium brand, but more because the brand positioning by the parent group doesn't include all the keyless systems so beloved of expensive car makers.