I'd argue this is basically impossible. Choosing what to report and how to report it. Which facts, how they are presented, etc. Listening to mostly left leaning shows, even when they think they're just reporting the facts I hear in their voice, their choice of questions, how they ask the questions, how they respond to the answers, which ideas they agree with and which they don't and in essence which ideas they want you to believe and which they don't.

PS: if that wasn't clear I don't listen to many if any right leaning shows. I listen to radiolab, this american life, flash forward, no stupid questions, etc....