I've come up with several strategies to try and minimise this. One is to read multiple sources with different target audiences. I occasionally read the Daily Mail (my mother gets it, don't judge) and the Guardian. My main source of general news is the BBC news site, but I also regularly read The Economist. From time to time I pop on to the Fox News site, partly to remind myself that the Daily Mail could actually be a lot worse. I listen to LBC in the car (A London based politics and current affairs talk radio show).
Genuine question - I'd be interested in how others approach this. Is my set of sources too skewed one way or another? Am I missing a decent balanced source, or should I add a credible source on any particular political leaning?