Here is a NCPA summary of a Cato Institute paper about public broadcasting.

Assailed from all sides with allegations of bias, charges of political influence and threats to defund their operations, public broadcasters have responded with everything from outright denial to personnel changes.  Yet government-funded media companies are inherently problematic and impossible to reconcile with either the First Amendment or a government of constitutionally limited powers, says Trevor Burrus, a legal associate at the Cato Institute’s Center for Constitutional Studies.