The level is 6, you only need one, pretty much EVER. Stats do not matter on a radio man, so use the worst one you've got.
There are higher level requirements for Starting a clan or fleet, but for most people once he's a radio man you can take him off the ship and just use him in that little red circle off to the left.
Remember you will need to place him in that circle to be able to use him to communicate/find your pals.
Good Luck and Have Fun!!
J-n
|