Sometime back, I blogged up a blog about RF.
In it, I mentioned that I use a Sony TU-1041U tuner to convert RF to composite video. You can also use an old VCR to do the same thing, or buy a questionable modern RF demodulator online.
Note: it has to be a demodulator. Not the more common modulator, like Radio Shack used to sell. (Ah, Radio Shack... how we miss you.)
Here's mine, next to my 7800 for scale:
Besides being much more compact than a