According to these illustrations on installing an XM antenna and tuner in a 2005 Camry:
http://home.nc.rr.com/jonathan75/CamryXMRadio.pdf
and this illustration / factory service manual for installing the GPS antenna for the factory navigation option:
http://www.camrystuff.com/manuals/Gen5/67_AV_System.pdf
A satellite radio S-Band antenna (whether Sirius or XM) can be installed in a space under the speaker grille on the rear deck... receiving radio through the rear window.
Has anyone done this install or used it? How well does an antenna receive in such a location?
Any recommendations on alternative install locations?