This is not true.
Under 18 U.S.C. Section 1464, “[w]hoever utters any obscene, indecent, or profane language by means of radio communication shall be fined under this title or imprisoned not more than two years, or both.” Under 18 U.S.C. Section 1468(a), “[w]hoever knowingly utters any obscene language or distributes any obscene matter by means of cable television or subscription services on television, shall be punished by imprisonment for not more than 2 years or by a fine in accordance with this title, or both.” Likewise, under 47 U.S.C. Section 559, “[w]hoever transmits over any cable system any matter which is obscene or otherwise unprotected by the Constitution of the United States shall be fined under Title 18 or imprisoned not more than 2 years, or both.”
It's a good thing that natural rights are a real thing and not just something you enjoy ranting into your computer about.