content: I think you're slightly misunderstanding the point here. Imagine an advanced civilization is waiting in a 100LR proximity from us, and our 1st signals are getting close. EXCEPT, that civilization hasn't used or even scanned for any communications in the radio/light spectrum for 5000 years. They would never see us because its become a long forgotten technology, and we would never see them because the tech to receive or even comprehend their transmissions doesnt exist.  Remember we're only looking for contact from means we understand because that's all w  3110  e have to go by, and they may be looking for something along the same lines. Me may both be looking for something familiar, as in we're sending smoke signals because thats what we understand, and they're using quantum teleportation transmission, because thats what they understand.