Honestly, I think you'll be better off getting a device designed to do surveillance recording. They start at a few hundred dollars and have features aimed at the surveillance market. Multichannel, motion detection, time-lapse, etc. Search google for "surveillance recorder" and check ebay.
You can use the Antenna RF input to do manual recordings.
I've tried this to record things from my satellite box.
I just put the RF output right to a 'T' with the rooftop antenna cable.
The main problem is that the Tivo automatically names the recording with whatever is showing on the program guide of the "donor" channel (channel 3 in my case). The other problem is the quality is terrible since it is going through RF modulation.
I suppose you could get an RF modulator for a video camera. But I agree with previous post. It would be better to spend money on a dedicated surveillance recorder.
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