I once saw a post about higher frequency VNA and where Gabriel told that they are not too cheap. I even posted on that thread, but now I can't nothing about it. Where is it, and what is the VNA.

Not sure if you are looking for this ( http://arinst.net/ ).

Portable 2-Port Arinst VNA-PR1 1-6200 MHz

https://www.aliexpress.com/item/1005001738222447.html

http://www.arinst.net/files/2114-ARINST-VNA-PR1/User-manual-ARINST-VNA-PR1-1-6200_ENG.pdf

activate subtitle to English or Russia

https://www.youtube.com/watch?v=zaoWuA1aDFc

My thanks to all of you. I think that the ARINST is just what I was looking for.
I wonder why I couldn't find it here on forum(s), even if I remembered that I posted in that thread.

[Edited Message Follows]

My thanks to all of you. I think that the ARINST is just what I was looking for.
I wonder why I couldn't find it here on forum(s), even if I remembered that I posted in that thread.
Edit. Now, when I knew what to look for, I found the original thread, too.