[Eric]

Easiest way is to get the players coordinates (that uses the radio command), and create loop through all of the players. Check how close they are to the players coordinates (IsPlayerInRangeOfPoint(x, 5.0, PosX, PosY, PosZ), and also check if x == playerid. If it does, return. Else, SendClientMessage(x, GRAY, "* %s", radioString);

Obviously you need to tweak the above functions to match your variables.