Conservative media today would be nowhere as even-handed as Buckley, who actually believed in the exchange of ideas.
Incidentally, Firing Line was restarted in 2009 with Herbert Hoover's granddaughter as host. She is conservative, and former Fox commentator, but anti Trump, as I suspect Buckley would have been.
If there's any liberal slant in PBS/NPR, I suspect it's really in PBS News' various shows. But, the presence of Firing Line in the lineup indicates more of an effort at even-handedness than most.
I suspect that those of you claiming its liberal captured don't listen to NPR or watch PBS. Like most things, you've been suckered by propaganda.
Also, caught up on some American Experience and Frontline. The AE on German American Bund was excellent. Almost completely factual, but it has darky and Jew commentators (woke!). It's timing is felicitous, as is the one on the Gilded Age. THAT is the very subtle liberal slant of PBS.