If you're thinking of "reporter" as someone who gathers and shares news:
* Source: Someone who provides information to a reporter.
* Subject: The person or thing being reported on.
* Analyst: Someone who interprets and analyzes information, but doesn't necessarily gather it.
* Commentator: Someone who offers opinions or insights on news events.
If you're thinking of "reporter" as someone who writes articles:
* Editor: Someone who oversees and edits written content.
* Novelist: Someone who writes fictional stories.
* Poet: Someone who writes poetry.
If you're thinking of "reporter" as someone who communicates information:
* Receiver: Someone who receives information.
* Listener: Someone who passively listens to information.
Ultimately, the best antonym will depend on the specific context in which "reporter" is used.