t-boy

I have installed a Sirius Starmate into my area where the cigarette lighter is. Looks pretty good and I can close the compartment andyou can't see it. Only problem is it uses the FM modulation to play through my radio. With the unit in the compartment it gets very poor, static reception. I found a Wired FM relay that plugs into your radio antennae from the Sirius unit and is supposed to improve the reception. Anyone tried this? If so, where is the radio antennae for me to plug into?
Thanks