The wavelengths that are most likely for communication with other civilizations are those in the water hole.

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The water hole refers to a region of the electromagnetic spectrum that encompasses radio frequencies between 1,420 to 1,666 megahertz, which corresponds to the spectral line emissions of hydrogen and hydroxyl molecules. These wavelengths are considered ideal for interstellar communication because they are not absorbed by cosmic dust or affected by ionized gases, and they are sufficiently powerful to traverse large distances in space without significant attenuation. Therefore, many SETI programs have focused on searching for signals in the water hole or other characteristic frequencies, such as the 21-cm line or the 1420.4058 MHz hyperfine transition.

The Wavelengths That Are Most Likely for Communication with Other