There is a decent amateur community for receiving satellite transmissions. I'm not super knowledgable on it, but 2 resources that may interest you:

Scott Tilley, who gained a lot of recognition in the past year in analyzing radio signals to see how Russia was using satellites in Ukraine: https://twitter.com/coastal8049

An amateur group revived 2-way communications on an abandoned satellite: https://sservi.nasa.gov/articles/isee-3-reboot-project/#:~:t....