When overriding the method 'GetKnownChannel' in SCR_VONMenu as follows:
"
[BaseContainerProps()]
modded class SCR_VONMenu
{
override static string GetKnownChannel(int frequency)
{

		return "Hello";

}

};
"
The change takes effect when the VON radial menu is opened by pressing 'G' in game, but the vanilla method is called instead when cycling frequencies until the menu is closed and reopened.
May have something to do with [BaseContainerProps()]