Thank you. Would the garage doors act to block any signal? As the front door is seldom used, as this is the exit to the garage.If your car keys have any sort of electronics in them don't hang them near the door. Car thieves use relay boxes to boost the signals to either break into your car or to drive away with it. Press reports of exactly how this works are vague, but it's a common problem. Car companies are avoiding talking about it as they don't want to admit liability.
The thieves work in pairs. One stands next to the car with one relay box, and the other waves another relay box around the front door or window to pick up the signal from the key. They open the car electronically and can in many cases drive it away.
I've seen varying recommendations on how to deal with this, ranging from just keeping the car keys in a spot near the centre of the house, to keeping them in a metal box (e.g. a metal tea tin or something like that). Generally though, the thieves are looking for people who hang their keys by the front door.
Electronic security in cars is pretty poor, and even the cars with supposedly the best systems are getting hacked and stolen all the time.