Jan 5th's Astronomy Picture of the Day shows shells around the galaxy NGC 474. Comparing the DSS to antennae galaxies, it looks like it will be more difficult to see these shells than to see the tidal tails of the Antenna galaxies (but DSS is not calibrated, so we can't be sure). I couldn't see the tidal tails of Antenna galaxies with a 25" under my usual observing conditions.

What does it take (i.e. what aperture, what kind of skies) to see these shells around NGC 474?

-- Akarsh