Just my $.02,,,, I have put these systems
in stores that have the Main wires run
through conduit, this has caused some
interference in some cases. I found that
raising or lowering the camera a bit helps
to even out the signal. A little tweaking
on the cameras and or receiver can just be
a " test and tune " that in some cases mght
take a min or two. It's well worth it in
the end. I hope this helps some.