Well perhaps it is a little farther away than just above the roof, some 140 million kms or so and receding.I took this photo from my roof top in suburban Adelaide so it really does not do the comet justice.
For really great photos have a look at NightSky Hunter (Mc Naught Gallery)
also try Astronomical Society of South Australia if you want to learn more about this awesome cosmic visitor.
…Robert 🙂