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I have heard something but only brief. not sure about it. I have been mainly concentrating on 1.4GHz molecular Hydrogen mostly along with my astro photography.
I think they may be for satellite finding not so much radio astronomy. There is a slight difference. Satellite observing can easily be done with the foxtel dish and an SDR which are really cheap.
There are many other frequencies that can be measured but I though Hydrogen is the most abundant and worth a look in
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