A:AnswerAntenna required depends on local over the air broadcast channels. How far are you from transmitters, what is the terrain between you and transmission towers. If you are in a more urban situation you may get by with "rabbit ears" or similar, other may require a higher gain antenna on a 20 - 30 foot mast. I would consult with your local BestBuy dealer.
A:AnswerYou could try to do a Factory Reset, go Home > Settings > Device & Software > Reset to Factory Defaults.
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A:AnswerNo, you cannot join a Zoom meeting on this TV, the Zoom app is not available for download. Try to use an adapter like the Apple Lightning Digital A/V Adapter - Model MD826ZM/A to hook up an iPhone to the TV.