The thin cheap stuff (category 1) is fine until you go beyond 20ft, so long as you don't string it along your power wires or loop it around the refrigerator. Remember, this isn't analog. It's digital across differential pairs.
Beware store advice. Their biggest commissions are given for overselling nonsense with fear.
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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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