I am currently trying to build a pyramidal horn antenna. The horn antenna is designed for the hydrogen line at 1420 MHz. The copper probe at the end of the waveguide is soldered onto a 4-hole SMA panel mount.
I'm using this LNA and this SDR and this SMA Connector Kit. I am struggling to find a 4-hole SMA male panel mount which I can use to solder the copper wire on to. Are there any alternatives which I can use to fix this issue?
Here is a link to the documentation I am following: https://physicsopenlab.org/wp-content/uploads/2020/07/Hydrogen-Line-Project-Documentation.pdf