Yeah, totally, I'm reinforcing your point. Fox News and conservative AM radio (which has many programs with a larger listenership than Democracy Now, I'm sure), not to mention places like Breitbart or OAN, portray unions negatively or not at all, while other mainstreams sources mostly just ignore them. You've gotta go pretty fringe-left to find anything that treats labor action outside of maybe the AFL-CIO or a few Hollywood unions and guilds, as worth consistently covering at all.
Probably next to none.