Answer:
he wanted to ensure that programs for his Fox network would be listed
Step-by-step explanation:
A media baron is a person who controls and owns many newspapers, magazines, television companies and publication houses, etc.
Rupert Murdoch, a news entrepreneur owns the global media company, the News Corp. Murdoch controls the media empire which includes The Times of London, Fox News, and The Wall Street Journal.
Walter H. Annenberg sold TV Guide for $3 billion to Rupert Murdoch's News Corporation. Murdoch bought it because he wanted to make sure that the channels for his Fox Network would be listed.
Thus the answer is ---
he wanted to ensure that programs for his Fox network would be listed