The forum home page is
https://mode-zero.uk/index.php

It was originally mostly dedicated to single channel, almost free flight designs. Now has many diverse topics. A keen interest of mine is the electronics projects. There is a thread on making a scanner to evaluate the signal of your Tx.

Also have interesting projects to make 2.4 GHz, legal Tx and Rx, from easily available, FCC compliant, RF transceiver modules.

See this area of site
https://mode-zero.uk/viewforum.php?f=42

This is one very comprehensive thread.
https://mode-zero.uk/viewtopic.php?f=42&t=971

And 1 I have followed closely as I use FrSky 2.4GHz gear
https://mode-zero.uk/viewtopic.php?f=42&t=1092

Nothing like the smell of electrons in the morning