WCIU is Chicago's CW station. My CW station is out of the Quad Cities. As for DirecTV, I don't get the WGN station in high def either, but they did say that later this year, they are adding a lot more high def stations, so I am hoping that WGN is also one.
There is talk that there may be a Cubs Channel in the near future... similar to the YES network for the Yankees. If this does become a reality, I may never leave my house!