Here is a tutorial on How to add custom radiostation to the game.
Note: This method only for server admins who can edit it in server files, on client its visual-only.
Description
1. First you need Voice Props DLC pack on your account
2. Next you need to open rust local files,
3. Then open the folder (Your Rust Folder)\RustClient_Data\StreamingAssets
4. Open file RadioList.txt with Notepad
5. and add your radiostation
“RadioStation Name”:”Radio Station Stream URL”
(dont forget to place “,” letter after last radiostation)
Edited file must looks like this
And its done!
Thanks to Bernard for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.