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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