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> If you want the robot to send back some information, then it will be traceable - you take the robot apart, and work out where it would send information to.
No, you have it send radio signals back in many directions - which it would have to anyway since you would have no idea if it was upside down or whatever when it sent its signals.
> Yes, I suppose he is saying that all technological species will hide fairly quickly once they become visible.
So your theory means that 1 second after a species invents radio, they hastily shut it down? 
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