Anatomically correct radio communication

Could animal produce less than 700MHz radio waves to communicate ? I don't want those waves interfere with mobile phones and other intercontinental radio communication my space colonists would use. Is it harmful, and could they produce an alternative current powerful enough to produce those waves? Is it exhausting?

Edit: The 700MHz is because I want an alien race using the radio communication I'm talking about would not interfere with space colonists communication, but one day settlers' technology is broken and they decide to use lower frequencies like amateur would do for trans-continental radio communication and then colonists would discover my aliens from the weird interferences.

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Anatomically correct radio communication

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