Okay, I'd like some feedback on this idea of mine. To try and understand what I am getting at I'll give an example before I ask the question. I should note, I have greatly simplified the situation. In the ocean a submarine is detected by SONAR by the air/water boundary. Sound waves are reflected off of this so you can hear a vessel over 500 nautical miles. The air inside directs sounds waves to hull, which in turns, acts like a microhone, reflecting it into the water. (This is why reactors etc are mounted on 'rafts') In a void, which is a space void of anything, except maybe light, you would want to reduce your energy emisions to reduce your radar signature. While the hull will not act like a microphone in the same way the hull on a submarine would, the absence of anything else would be just as significant in trying to track a ship. In order to reduce energy emissions, some type of 'shielding' or an Electronic Counter Measure (please say ECM, much easier) system may try to pump out an inverted form of radiation, nullifying what the ship produces. Is the second statement a logical extension of the principle of the first? When you reply, could you please explain your answer.