Reddit reviews THE CIMPLE CO RF and RCA Coaxial Adapter | 4 Pack | RCA Female to Male F81 (F-Pin) Connector, Adapter, Coupler, and Converter - for RG11, RG6, RG59, RG58, SDI, HD SDI, CCTV
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FUNCTION: Used to convert an RCA cable to an F-type coax cable or F-type female jack into an RCA jackEASY INSTALL: Simply plug the RCA video cable into the adapter, and use your hand to twist on f connector (coaxial connection) - does not require any crimping tools or additional equipmentPREMIUM DESIGN: Not only made of high quality anti-corrosive metal, but they are cleanly threaded and deliver a secure connectionGAME ON: Use as a TV adapter to connect your older gaming consoles (including Atari 2600, 5200, 7800, Nintendo, Intellivision) to newer big screen TVs and moreQUALITY ASSURANCE: Includes a US manufacturers warranty
Wrote this for another user recently, but it might be helpful for you too:
C64 has two different ports you can use to output video and audio. These are the RF port and the Video port (see here).
Easiest way is to use an RCA cable with an RCA to Coaxil converter plugged into the cable/antenna jack of your TV.
Alternatively, you could also use a C64 video to composite cable but you need to be careful. The three composite cables that come out of that usually don't correspond to the modern "video, left audio, right audio" that we are use to. They correspond to "chroma, luma, and audio".
That means if you want to get a clear picture, you would have to combine the chroma and luma into one signal using something like this. You can then split the mono audio into two channels with an RCA Splitter.
Option 3: Pick up a composite to S-Video Cable and use that, or if your TV doesn't have S-Video, you could also convert it to HDMI using an S-Video to HDMI converter box.
That is why. RF is literally tuning in an "over the air" signal. The modulators that generate these signals for your console are very weak, and are sometimes susceptible to interference. I would recommend using at least composite if your TV supports it. If not, this adapter may also help.
https://www.amazon.com/dp/B07PD1RGQF/ref=cm_sw_r_cp_apa_i_6LeyDb5MAWT86
Run any composite cable from the back of your console to this adapter, and plug the adapter into your TV. If the cable is hardwired to the console (as is the case for the Atari 2600) run that wire to this adapter. This adapter has less interference than those switchboxes. Hope this helps!