Originally Posted by 98CoupeV6
You need to read the directions on your sirius, that's not how an fm modulator works. This could also lend some insight as to the reason why you can't undo a couple of philips head screws.
if it's a hardwire fm mod kit, like the Delphi XM 1, then you'll need to run your power antenna wire though the kit, and from the kit, back into the radio.