[mywittyname]

I don't think this is the case. Sinclair Media, NewsCorp, and iHeartMedia (formally ClearChannel) are heavily conservative, very open about it, and dominate their respective fields: broadcast local television, cable television, and local radio. They are the largest, and most mainstream of all media companies. And there's plenty of crossover. Plenty of Fox News personalities have syndicated radio programs aired on iHeartMedia stations.

Yeah, NPR and CNN exist, but none of them draw near the audience of their conservative counterparts do.

It would be more accurate to say that conservative media is highly concentrated while liberal media tends to be much more diverse, but draws far fewer people.