You're missing an entire step in the chain.
First, what you're talking about is an RF demodulator which will take the RF signal and change it into a video one.
However, the device that must be connected to the antenna is a tuner. You first need to "tune in" the signal that you want to watch. Input from the antenna would include every station on the air (of all types). So you first need to filter out everything but the desired station which is what a tuner does.
The receiver has a tuner built in, but it is restricted to the AM and FM audio bands for obvious reasons.
As stated above, you're best bet is to acquire a cheap stereo VCR which has all of these capabilites built-in. Use it as a tuner/demodulator and ignore the tape section. If you get a VCR with S-Video outputs, you can make use of those cleaner signals.