Government funding TV, radio and other media is pretty common worldwide. In NZ we have a good history of it too. I'd say if politics want to control media, then they will. No matter who funds it. You just have to look at the media in this country.
RNZ is the best proof that you can state fund without politics getting too much in the way (bar docking their portion because they are a pain in the proverbial to them).
I think government should be involved. Not because I actually like that scenario but because we can clearly see that private is a race to the bottom and govt funding seems to be the only way of (currently) preventing that or at least slowing the descent.
Netherlands, Germany and other countries have very good public TV and radio programmes that are not anywhere nearly as politically influenced as most private channels. It seems Britain is the exception with a very political BBC but I must admit i am in no way accross what's going onthere. Personally I'd be content with Radio, web and online TV. I wouldn't need a full fledged TV behemoth. And RNZ listener numbers show that there is a big market for what they offer. They are pretty much top spot on radio (and Govt chopping their funding is clearly politically motivated as you don't voluntarily hinder a winner).

