Question about re-using internet satellite dish
Hi all, my son has been obsessed with space pretty much his whole life and recently he mentioned he would like to use a radio telescope. I'm attempting to re-use an older internet dish for a cheapish DIY project we can do together. I've done a bunch of google and youtube watching, I think I pretty much get the gist of it once there is an RF signal out of the antenna, but I'm not quite sure what I need to do to get the RF signal in the first place. Most of the material just says to attach the feed to the LNA, but what does a "feed" look like?
Attached are a few pictures of the dish/antenna. I have a Nooelec SAWbird+ H1 and NooelecRTL-SDR V5 so far. Is there something I can stick into the "head" I have here or do I need to replace it with something else?