Whoah, that's a neat idea. Using a scanner to find wireless camera
frequencies and then tuning them on a little portable color TV!

that's just the trouble. The R3 does not scan video frequencies. Even
though it was advertised as being able to do so.

and also advertised as a "video scanner"

In video mode, you have to tune manually.

Sort of Like you had to do with audio on the old Radio Shack Patrolman
radios for audio.