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As the others said, you won't get much by tuning. With a stock antenna, range is mostly about channel selection and antenna placement.
That said, antennae are cheap if you make one yourself. A directional can be as low as $2 in parts plus cable, omni about the same with more work. You might get enough gain with just an aluminum foil collector for the existing antenna.
Google "antenna homemade" for a more than you wanted to know.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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