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I agree with Bojan, trying to receive a signal from 4 light years away will be virtually impossible, even if it had a 1 Megawatt transmitter on board.
NASA has enough trouble communicating with existing spacecraft on the edge of our solar system and they're only 1 light day away. Plus these spacecraft have a decent size parabolic dish pointing back at earth.
I think this is a publicity stunt ( a fool and his money) and needs a further re-think.
Bill
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