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trik, I get what you are driving at...
But it is not the teardrop tapering OUTLINE that is important, it is the overall cross section profile area that needs to taper to be better aerodynamically.
It is due to this reason that some early fast fighter aircraft fuselages had a strange 'dimple' at the point where wings met the fuselage The wings added a sudden additional area when cross section is considered. That prevented the aircrafts to overcome drag particularly flying close to Mach1 figure. the trick designers used there was to give a 'dimple' in the fuselage, that reduced sudden increase in the cross-section area. This helped push aircrafts to higher speeds. google and you can find some references in the US air force fighter aircraft history.
The sharkfin antenna does look fatter at the front tip than the end - if the end is tapered in its vertical wall cross section, it would be better. Jury is out on that here as the rear view is not clear.
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