Do you have any particular references for backyard radio astronomy? I have been thinking about a visible light observatory, but those have a lot of constraints. So I was curious what could be done with a backyard SDR setup.
[1]https://hmcguinn.com/posts/hydrogen-line/ [2]https://www.rtl-sdr.com/cheap-and-easy-hydrogen-line-radio-a... [3]https://physicsopenlab.org/2020/09/08/milky-way-structure-de...