I am no particularly technically ept, and my wife wanted a serious Sirius install. I lucked out - I was able to run the wires basically all out of sight - a clean, well functioning install. Here are the basics for Sirius Sportster 5 - pics below for reference. Oh yeah, one audio suggestion - make sure you turn the audio voume up to 100% on the Sirius radio - it boosts the signal to noise and reduces drastically on any hiss in the Smartcar radio.
1. Antenna - placed inside the car, on the dash, far left - make sure iutis fr enough back (ie on the cloth, not on the plastic of the dash) so that the windshiled stickers don;t block the "view". run wire to the left, down the seam, under the dash. invisible! and no duct tape!
2. audio - drill a hole in the back left bottom of the glovebox, just big enough to run an audio cable. use a right angle adaptor and plug it into the audio socket on the glove box, attach your cable, and run it under the dash to the sportster
3. Sportster install - ahhhh - use the suction cup thats for the windshield mount, and instead mount it un the horizontal plastic that runs under the dash just to the right of the cig ligher. the suction cup just fits - tight grip - has not fallen yet!.
4. power - plug in power adaptor to cig lighter - only visible wire
see pics below - hope this helps someone!
Djinn