And you would need 4 VCR commanders, 4 VCRs
and 4 Video or A/V recievers. Each reciever
and transciever can handle up to 4 cameras.
If you try to do any more than that, a
motion sensor in one group of four would not
turn off the cameras in a nother group and
you would get signals from multiple cameras
on your reciever. You would also be using
all four of the recievers available channel,
guaranteeing someone can tap into the
system. If all cams are outside, not a
problem. I would suggest going with a wired
system with always on cameras and an auto
switcher and/or video multiplexer for as
much of the setup as financially possible.