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What would a radar device see if it was used only to receive already present signals?

If a radar device was tuned into a natural signal such as the schumann resonance what might be seen?

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  • Apr 18 2013: Isn't this done by SETI and radioastronomers?
    • Apr 18 2013: Yeah, I thought that's what a radio telescope was.
      • Apr 19 2013: Of course, scot you may be suggesting other uses I haven't heard or thought about.
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    Apr 18 2013: Probably the signals that were already present.