WFN TV is pretty much aired in Canada, only. PBS has been running The New Fly Fisher for a while, but not all PBS stations pick it up. The New Fly Fisher is sponsored by the IFFF. The good news is that more are currently bringing it on board. I've been watching it for many years. I also personally know most of the staff...and many of the guests on the show. Good bunch of people. I have always enjoyed the show, since it focuses more on teaching fly fishing rather than mostly product promotion like many other fishing shows seem to do. You can actually learn stuff.
You can access some of the older shows on YouTube. Here's one with the fella (Ian) that mentored me for several years. I was trying to find the carp fishing one, as I was there for the shoot. (Funny day).
Shameless selfie with Bill Spicer without his fishing hat!
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....and if you haven't found it yet... The New Fly Fisher Magazine. It's FREE and it's quite good. Lots of great info, including full length fly fishing videos...and I've been reading this one for years too.