How do you deal with the space ship on top of the TV Tower?

This is a bit tricky but it's just about being in the right place at the right time. When the spaceship is firing missiles, njust run around in circles in the same direction as the ship. When it settles again just stand on the left or right hand sides of the roof while it shoots that fire out and then make sure you are fairly close to it (but still at the side) so that when it stops shooting stuff and the green button appears you can dart in there nice and quick and hit it with your stun club.
Hope that helps