Poor picture quality viewing some videos on my HD or 4K TV

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LG 50 UP77 4K Smart UHD TV, with Magic Remote, HDR10 Dynamic Tone Mapping, 60Hz, Auto Low Latency Mode, 2 HDMI & 1 USB 2.0 inputs, Voice Assist Google Assistant & Alexa

Configuring the right picture settings on your new TV

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Configuring the right picture settings on your new TV

Poor picture quality viewing some videos on my HD or 4K TV

Signal Booster, SLx TV Amplifier Four Output 27820BMR - Improve Picture Quality And Channel Reception - Boost Your HD TV/FM/DAB Signal. 4 Way - For HD and Freeview, Grey : : Electronics

Finally ran into these limitations with my first HEVC 4K video. Anyone find a solution ever? : r/PleX