Head to the 8-10 VCN Building (the news building) on the west island of Vice City. The news building is by the northern bridge entrance on the west island. You can enter the door of the news building and head up to the roof.

Along with the news chopper, there's an easter egg you can get to. There's another buiding close by, but on an angle with the window closest to the edge of the heliport. Make a sprinting jump through the window and you should see an empty room with an easter egg in the middle.