These were taken at night, without any lights on, its the easiest to see like this, though its still there during the day with normal lighting as well. This is a storage building and I access the cameras remotely. I will try to get some more pics with lights on. Thanks for the responses. I tried to do some research myself as well, and read about ground loops but wanted someone who has more knowledge than I do to take a look. This is a new install, that I've done myself. Ill update with some more pics, and I will try disconnecting one camera at a time.