Oh, and if you want the radios to emit some sort of particle when it says something, make a decal for it. I plan on making it so you can switch from listening to chat channels to off or to music. And plan on making it emit the sound of static if no one is on your channel.
Also, I do not know if I can make the range for the radios limited, because it might lag if I make it search through ALL of the bricks in a giant radius, and then make those radios found search for all the players in a smaller radius.
I'm testing it right now, so come if you want.