I had this xB XM kit that I got used off eBay. The antenna was huge and was honestly ruining the car lines. So today I finally got to replacing it - had to buy a 2-1 adaptor (2-wire to single wire adaptor for XM antennas $30) and a Terk XMICRO antenna -$30 (the size of the stack of 4 quarters). Played with its placement - tried putting it under the sunroof wind deflector - looked awesome (could not see it at all), but reception was questionable. So I ended up putting the antenna in the corner of the windshield.