Sweet! I sincerly like it. I can see tons of event happenning in a tower like that in a hack.
The only 2 issues I see are:
1- The right ''curved pillar'' is shaded as if light comes from right, while the antenna clearly shows that light is coming from left.
2- Both back ''base pillar'' are too small. The base is a perfect rectangle, so it implys that front and back should be the same dimension horizontally. Otherwise it should be a trapesium. Thay also aren't tall enough. As the tower doesn't seem that much deep, the pillar should almost have the same height