Here is some information that looks too good to be true. It is really good for the start.
If you search in yandex "pbsamerica live" there are a few links to click on.
Here is one:
https://zattoo.com/live/pbs_america
https://en.wikipedia.org/wiki/Zattoo
You need Swiss VPN to access this site. UK and US IPs are not available for Zatoo.
Once you get Swiss VPN, there are options to register as unlimited time free user or premium.
I registered as free user and right now as of time of this writting I'm watching PBS America live,
pecisely what is on this schedule at this time:
https://www.pbsamerica.co.uk/schedule/
This is how it normally looks like, of no use to PC viewer.
https://www.freeview.co.uk/get-freev.../pbs-america-1
To enjoy this channel you'll need a TV with Freeview HD built in or an HD-ready TV connected to a Freeview HD Recorder.
It is possible to talk to PBS directly in a few ways.
But, if they would be as useful as Smithsonian, it would be a waste of time and energy.
You'll find better help in Cabulo Smithsonian thread on this forum.
https://www.instagram.com/pbs/
https://www.facebook.com/PBSAmerica
https://twitter.com/pbsamerica
