Home Cctv

My neighbours have CCTV cameras watching the cars on there driveway, but the cameras also pick up the conversations my wife and I have when on our driveway or balcony. Are these cameras legal or is it an invasion of privacy?

We have had some trouble recently with someone messing with our cars while we are gone. We want to purchase an inexpensive home security camera, something we can set up outside. But it would have to be motion activated, and possibly be able to view in the dark. I don’t know anything about security cameras, and in the process of trying to read up on them, I’ve just become more confused. We don’t have a lot of money, so any inexpensive suggestions would be helpful. They would have to be wireless as well. I don’t know how or what we would use to record the video…like I said…I don’t know anything about security cameras…any help or suggestions would be very much appreciated. Thanks