by James M. Atkinson
Use a tuned 15.735 kHz small loop resonant antenna with an E-field shield and using Litzenstein wire (40-50 loops). Then pass the signal though an 80+ dB 8+ pole bandpass filter with a bandpass of 3 kHz or less (a 130+ dB filter is ideal). Next tune the filter and the loop to compensate for any impedance mismatch (between the filter and the loop). You basically want the circuit to give you a peak signal at 15.734 kHz.
Attach a low noise amplifier of at least 40-60 dB to the output of the amplifier and directly drive a simple 30 dB logarithmic display, and optionally a tone generator that shifts based on the logarithmic display. Set up the lowest element of the log display for the KTB for the entire circuit so that a 3 dB increase over the KTB noise illuminates the second element.
Next attach the loop antenna to a non-metallic, non conductive collapsible pole and pass antenna over all surfaces in the area being inspected. If you get within 2-3 feet of any concealed video camera or wiring carrying a video signal you will detect it.