Before I got the car I put a wifi analyser app on my phone - there are several to choose from for Android but I don't know about Apple - and used it to work out that there was miminal signal where the car was going to sit - even though it is quite close to the router the signal wasn't getting through the walls. I use Google Wifi units so got another one (cheap on eBay) and put in the window nearest the car, and that solved the problem for me. If I had a garage I'd likely have used an extender.