Judging from the screens, I'd recommend you start to get familiar with the very basics of modelling first.
Like there's no point in using two stacks for a straight cylinder. Stuff like that aren't even matters of high or low poly modelling. It's just a typical beginners mistake, which you need to get aware of as soon as possible in order to get something done correctly.
I just gave it a shot and managed to create the basic shape with 122 polys. Pretending the thing would be used within a rather "concealed" rocket launch silo of sorts, you could work up to a poly count of 500 max total. Just to name a number.
It all starts with a cylinder, 10 stacks / 8 slices. On the top, there're all vertices snapped together to create that spike. This upper "ring" is just the third stack extruded and scaled up uniformly along the x and z axes (while y is the vertical one).
The wings start with a box, with the upper face extruded so you'll get a second stack on top. Again the upper vertices snapped together in order to create the spiky top. Scale down this house-shaped box along z-axes, until it's flat enough. Duplicate the whole thing and rotate by 90 degree along the y-axes.
Polys = Triangles / 2
Hope that will help you understand what the hell I'm talking about. :)