NPR gets 1% of it's funding directly from the Feds:

https://www.npr.org/about-npr/178660742/public-radio-finance...

Local PBS radio stations do get more funding through the CPB (corporation for public broadcasting), but that seems to be only about 12% from local/state/federal sources.

The CPB itself seems to get about $450 million a year from Congressional apportionment.

https://www.cpb.org/appropriation/history

However, most of the funding PBS/NPR gets are from private and corporate donations.