Usually WiFi, so it doesn't need a cable to transmit the video/audio. The video processing electronics in cameras probably also emit some RF but that would be

Usually WiFi, so it doesn't need a cable to transmit the video/audio. The video processing electronics in cameras probably also emit some RF but that would be at a variety of much lower frequencies and only detectable with something like a loop of wire and an oscilloscope over very short distances, like this: https://www.meilhaus.de/en/infos/beehive.htm https://www.meilhaus.de/en/infos/beehive.htm