How much power does the right need before they're considered "in power"? They controlled both branches of congress and the presidency until 2018, and have a majority on the supreme court. Fox news is the most popular media platform, and have tremendous (but not full) control over the mainstream narrative.
This as "in control" as a single party gets in the US.
Aside from the LPFM repeater stations, largely used for religious broadcasting, I would say that the radio market has been completely captured by the left.
When it comes to the right, they have Fox for television networks and that's all.
That's true for the lower half of the FM dial (aka the public good section that naturally aligns with left leaning ideals), but not the top half or AM.
"[Fox News] has been celebrating a 44-month consecutive streak as the most-watched network on basic cable and a 218-month streak as the most-watched cable news network, averaging 3.5 million primetime viewers and 2 million total-day viewers, according to Nielsen Media Research."
For terrestrial broadcast television in the US, the pro-Trump Sinclair-owned stations possesses 294 stations for around 75% penetration of total US households.
Also, news-talk stations are right-wing with the exception of NPR and sports.
Therefore, one can conclude the right-controlled media is mainstream media.