I would say that hacker news is actually a fairly objective aggregator. It's also participatory, which hopefully checks bias at some level. But, as this isn't television... it's not a valid example, in response to your question. Also, hacker news isn't ad-supported, which is nice.

But there is still bias here. Bias in the stories submitted, in that they're skewed toward the I interests of white male 20-30 somethings. Not a lot of diversity of opinion and point of view here, which is another way of saying prevailing bias.

PBS is pretty good, despite attempts by the right to brand them as liberal. Watching the PBS News Hour, you can almost see the anchors gritting their teeth as they give equal respect to guests spouting right-wing fabrications, but they still do it to remain as neutral as possible.

Probably not a universally unbiased source, but I think that many sources occasionally engage in objective reporting. I also think that number is probably decreasing in these times...