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Hydrogen emits around 1,420 MHz, so 1.4 GHz. In fact, they like to listen for potential signals from advanced civilizations within that frequency range. Hydrogen is also referred to as a waterhole because it tends to be, on a cosmic scale, tends to be a rather quiet area of radioactivity in the universe, and there's not a lot of interference happening around that range. So the thinking is that some intelligent life out there recognizes that as well, and that's when we communicate it by manipulating that frequency. Just drop in.