Did you install a ULF or TCU module? The instructions and BT install I'm speaking and answering questions about is for the TCU (telematics control unit) that was installed in latter built e53s. The ULF modules were used in earlier models e38s/e39s/e46s/e53s that usually had a physical analog BMW phone installed.
Have you seen this DIY thread that has pics of the e53 BT setup (and BT antenna)?
https://xoutpost.com/articles/all-bm...03-bmw-x5.html
{BT antenna is secured to the top of the bracket in the pic below - has white electrical harness connected to it. Click link above for more details/info}
