I wonder if he is using wireless cameras because I have an uneducated theory that I would like a smart person here to destroy. So please forgive my lack of knowledge here.
If I made a device that amplified the RF signal from a wifi router ... made it like it had the rf signal power output would that device be capable of "drowning out" other wifi transmitters ... making a wifi camera incapable of seeing its base station ?
RF signal jammers are a thing.... they also are illegal. Certainly if you had a RF source blanket the WiFi spectrum at 1kW, you'd knock out WiFi cameras (legal operation in the WiFi spectrum is limited to 1W, and is often used at less). The same idea would apply to anything using a radio, like cell phones, GPS, etc.
If I made a device that amplified the RF signal from a wifi router ... made it like it had the rf signal power output would that device be capable of "drowning out" other wifi transmitters ... making a wifi camera incapable of seeing its base station ?