I have an 05 tahoe with bose and onstar. It does not have xm radio currently. I just purchased a stock navi to put in and it has the xm option. I am trying to get the xm module to hook up. Currently i only have an onstar antenna on my roof. In 2006 gm made a single antenna with both onstar and xm in one. Will my current onstar antenna wire connect to the new antenna? And does anyone know where to mount the stock navi antenna? Thank you.