Quote Originally Posted by harryprocraft View Post
I have heard of the drive by readers too, my question is with some houses close enough together to spit on how can they not get it screwed up???
The way they would keep them straight is like ElectricSLT said, part of what it transmits is an ID number that is unique to each house. I'm not familiar with the system, but I imagine it works like the MAC address of a computer network card. No two of them in the world are the same (supposedly), and each individual packet of data that gets sent contains that address. So no matter what direction the transmission comes from, it's "tagged" with that number (a string of hexadecimal characters), so there's no confusion about which house it came from.