A twenty-three step Instructables build of an automated radio telescope. On the antenna, the author is direct about where it came from:
So, the first part of the project was making an antenna to improve the signal. I could have used a typical satellite dish, and it would probably work, but I used the design from DSPIRA.
What the DSPIRA lessons do not cover is pointing the thing by machine. This build adds a motorised mount and drives it, which is the obvious next step after a few nights of turning a horn by hand and writing down the angle.
Automated Radio Telescope, on Instructables
Published May 2020. If you build on it, the forum is the place to say how it went.