Rf coax to hdmi/rca question

Hello everyone. I have a North american toploader nes, and it has the classic rf coax plug-in. I play on the classic channel and it makes it look grainy and not as appealing, and would love to see it more crisp and clear. I do own the 1st edition nes and it does have the rca hookup, but the toploader works better and i mainly play on it. I was wondering if there is a device that can convert the rf coax to either hdmi or rca that you would recommend. Thank you in advance