As stateed it is 3 sets of 6 presets. unfortunatley you have to cycle through AM and the 3 SAT presets. Toyota needs a lesson in ergonomics, Honda does ergonomics way better. The antenna is in the front window just to the right of the rear view mirror.
If you look close at this picture in the link below you can see the bottom of it just below the dark tint line that runs across the top. It is not very noticable from the outside, the passengar however can see it plan as day. I question if this antenna is as good as a roof or trunk mounted unit like XM or if Sirius' technology is just not as good. With XM I never had drop outs, with Sriius I get drop outs all the time. Personally some love Sirius hate XM and vice versa. I have now had both and both have their pros and cons. Personally I prefer Sirius content, but the drop outs will drive me back to XM in my next vehicle especially since it is far more likely that XM will either be standard or the only factory option in most cars. XM has done a better job at locking up car makers in exclusive deals. I beleive next year Sirius will not be a Toyota option, only XM.
http://www.pbase.com/kluken/image/64409690