PBS is in no way biased. On every issue, the anchor interviews at least two people. Are American Enterprise Institute and the Cato Institute are frequently invited. You do not hear any of the interviewers do more than just ask questions, and they do not debate the answer. PBS is less biased, because they have more time to present the news. CNN hashes through headline after headline, and when they do a "special" on something,m they spend at least ten times more airtime advertising it than the actual "special"it self. a thirty minute show with seven minutes of ads is not the same as a one hour show with perhaps five minutes of ads, which is what my PBS affiliates here (there are two, one in Palm Beach, one in Miami) present. They are labeled 'left wing' because they are to the left of Fox, which is hugely biased to the ultra right. That, and the fact that they are partly publicly supported. The ads on PBS are short and not so bothersome: no yelling car dealers, no phoney doctors, just the usual BNSF railroad ads. I am not sure what it is that I am supposed to buy from BNSF.
The BBC is more of a European take on the news, with more Europeans and fewer Americans interviewed. The major networks avoid all foreign opinions, as a rule. I have not heard Gwen Ifill editorialize a news story--ever. She does ask tough questions, though. Miami PBS shows the McLaughlin Report, which has generally one Liberal woman and a bunch of righties, including Pat Buchanan.
I used to get Al Jazeera on Netflix, but they took it off. I do not have cable, because it is way overpriced. There is Comcast, which sucks, and ATT which sucks even deeper.
I watch the Sunday morning news interviews. ABC with Stephanopolis is by far the best presentation. Meet the Press is good when they interview some politician that is not a blowhard giving a speech. Way too much McCain and Lindsay Graham.
I know very little about Brian Williams, since I rarely have seen him.