Our only "official" news broadcasting facility is Voice of America, which is sent out via short vave radio to most of the world. It is prohibited by law from broadcasting to the USA, but of course the radio waves don't know that, and you can pick up VOA broadcasts on any decent short wave radio.
Public broadcasting on both radio and TV is partially funded by the federal govt., but it's not government broadcasting in the sense that the brodcast outlets in other parts of the world are. The big difference between us and most everywhere else is that the private sector has always had access to the broadcast bands, while in much of the rest of the world governments have kept control of air waves to themselves. In recent years,governments in other parts of the world have opened up their broadcasting to the private sector, and in almost every such case, the "government" broadcast outlets have become secondary. In the UK, for instance, the BBC has become more and more an also ran, since private broadcasting came in some years back.