I have my Stiletto 100 mounted using a Pro-Fit bracket called the "Ultimount" that uses an adhesive pad that sticks to the chassis and a rotating head that locks into your desired position. I'll post a pic as soon as I remember to take one. The windshield is so huge on the Fit that I just used some double-sided tape to the dashboard and ran the wire along the front of the dash where the windshield meets the board and underneath the dash and am using the Aux-in. I have absolutely no problems with reception and sound quality between FM-mod and Aux-in are night and day. While it's not the most stealthy of installs it does keep the antenna off the body so it's not as unsightly and there's no risk of damaging the paint (I had the antenna on the trunk of my Saab for 2 years and I managed to scuff the area where it was stuck pretty badly).
Pro Fit UltiMount - Universal Mounts