Channel 2 (Dispatch 2) is on the CIRN system (and is in the database). They typically use it for longer incidents, or incidents they don't want going over the main channel. If you can get Channel 1 (Dispatch 1/West) on the CIRN system, you can get Channel 2.
If you're listening to the analog VHF simulcast of Channel 1 (Dispatch 1/West), there's no analog VHF simulcast of the CIRN Dispatch 2 channel, as far as I know.