Installing a Sirius Radio - remove radio to get to the antenna wire

Hi,
I have a 2004 CRV. I recently purchased a Sirius radio and I want to install it using the option where I can connect the leads to the standard radio antenna, instead of using the cassette player.
I can not get to the wire that is behind the radio. Anyone help with getting into the dash?
Thanks for the help.:)

I have a 2003, so I am not sure if this would be the same, but to get behind the radio, there are two screws underneath the casing of where the radio is. Take them out, and the casing will pull out. Then you will have 4 screws that is holding the radio in, unscrew them and pull it out. You will have access behind the radio to put the adapter into the antenna slot.