Broadening SETI: From the Hydrogen Line to the Water Hole and Beyond

To the point

SETI now searches a broad spectrum—from the traditional 1.42 GHz water hole to low and high radio bands and even non-radio signals—building on the work of Cocconi, Morrison, and Drake and using modern instruments like Breakthrough Listen to widen the hunt.

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The Search for SETIs Magic Frequency
supercluster.com

The Search for SETIs Magic Frequency

While modern-day SETI (Search for Extraterrestrial Intelligence) experiments can cover a large sweep of the radio spectrum, no telescope can observe every frequency, meaning it still comes back to the question of which channels should be prioritized. Any aliens out there transmitting messages will be faced with a similar problem – which is the best frequency to transmit on?