Radio Frequency Impossible to Jam

Hi Folks,



I have a question



Is there a specific Radio Frequency that cannot be jammed or blocked by all other available means or a Radio Frequency that will still penetrate even a Heavy Shielded MRI Room with the MRI Magnet on?



ie. A sophisticated bugging device that will still work even within a Faraday Cage or any Radio Jammers?





Maybe say an Ultra Low/High frequency that is outside the frequency range of Faraday Cages or Jammers?



Thanks

Barry

Radio Frequency Impossible to Jam