NPR is about as close as you'll get. I suppose ALL news from all sources can be described as biased if you just assert that there were 'better ways to describe it' or 'different choices' about what should BE news.

I have heard stories about very 'conservative' issues on NPR that made little or no attempt to slant the presentation. (Today there was one on gun control and the 2nd amendment.) I almost NEVER hear stories on Fox that are not blatantly slanted! (So what? Here's 'so what'...they advertise as 'fair & balanced'. At least Keith & Rachael and Ed make absolutely clear that they are there to be the alternative to Fox, and that they make every attempt to get their facts right....as does NPR.)