Reddit reviews Home RF Modulator, fosa Universal Compact Digital RF Modulator Audio Video TV Converter Signal Converter, 47 to 868 MHz VHF UHF Signal Amplifier for All Local CATV Systems(Orange)
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The device to create a signal for your TV tuner is called an "RF modulator". However, using HDMI or VGA out of your computer as input to the RF modulator is also tricky, and basically requires another device that converts to something like a "composite" signal. The most common cheap RF modulators won't do UHF; they do VHF on channel 3 or channel 4. Here is an RF modulator that can also do UHF:
https://www.amazon.com/Modulator-fosa-Universal-Converter-Amplifier/dp/B07HBRBTHN/ref=sr_1_5?keywords=vga+rf+modulator&qid=1564824175&s=audio-video-accessories&sr=1-5
To first convert VGA to composite:
https://www.amazon.com/Sewell-Direct-SW-22050-PC-Converter/dp/B002PXFJ2O/ref=sr_1_1?keywords=vga+to+ntsc&qid=1564824278&s=audio-video-accessories&sr=1-1-catcorr
I found one box that perform both steps in a single unit, but the RF modulator is a cheap one, and only supports VHF channel 3:
https://www.amazon.com/Coaxial-Converter-Control-Support-Function/dp/B07DHM23VQ/ref=lp_11042001_1_7?s=audio-video-accessories&ie=UTF8&qid=1564824075&sr=1-7