Yes, and it wouldn't need to be a sensitive spectrum analyser. If the RF field is strong enough to affect human tissue, then a crude broadband RF detector woul

Yes, and it wouldn't need to be a sensitive spectrum analyser. If the RF field is strong enough to affect human tissue, then a crude broadband RF detector would do the job. Something as simple as a wire dipole and a schottky diode with a meter. Plus in such a strong field, most of your domestic electronics equipment would be going crazy. Just like a mobile phone near a blue tooth speaker.