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Interesting topic, to say the least.
IMO searching for a radio signal coming from extraterrestrial life is a mistake, because it assumes radio transmission is the most advanced and fastest way of communicating possible, and we know at it is inadequate for transimiting information over cosmic distances. There must a be a better way of communication that we have not discovered yet, so we might be as deaf to civilisations talking to each other as would be a tribe relaying on sound waves be unaware of microwave and satellite communication.
For example, I could imagine that a spaceship could potentially exploit principles similar in nature to entanglement to communicate with its headquarters on the planet of origin or with other spaceships, bypassing slow radio transmission altogether.
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