An isotropic signal is a signal transmitted with equal strength in every direction in space. The energy required to broadcast an isotropic signal detectable over interstellar, or intergalactic, distances would be vastly greater than that needed to send a signal of equivalent strength from a directional antenna. Only a Type II or Type III Kardashev civilization would be capable of transmitting an easily detectable message in this way.
Related category RADIO ASTRONOMY AND COMMUNICATIONS
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