2005 honda odyssey lx wiring

Hi I have a 2005 honda Odyssey Lx. I am installing an aftermarket DVD player. I have the dash torn apart and am trying to connect the audio into the cars audio system. The van has the basic CD player radio. I already have an FM modulator and was planning to use that. However honda has a 2 wire antenna cable. My questions are: Is is possible to buy a pass through connection so I can insert my FM modulator into the existing antenna. I found an aftermarket antenna adapter, but it is not a passthrough. http://www.installer.com/item/display_item.php?it=40-hd20 Does anyone have the wiring diagram for the auxiliary input to the radio? Is it possible to buy a cable or adapter to a RCA connector?

you need the antenna adapters from metra 40-hd30.git yer swerve on!

I did some more scouring of the internet and found what I need. I have two choices. I can buy a "PIE HON03/PC-SON 2003-07 Honda Changer Interface/Auxiliary Adapter" for $90. This would allow me to use the AUX input on the radio. http://www.discount/detail.aspx?ID=287 Or I could buy a pair of antenna adapters and put my modulator into the middle ($23 each) http://www.installer.com/item/display_item.php?it=40-hd10 http://www.installer.com/item/display_item.php?it=40-hd20