I have a 75WXST too. The electronic box is under the center console, wired directly to the battery (with an inline fuse). The plug for the handset is mounted on the side of the center console by the driver's seat so I can easily unplug and stow the handset. The antenna is on the passengers side tailgate door jamb above the brake light. The antenna cable goes thru the vent behind the tail light and under the interior paneling to the front, under the glove box to the center console area.
More info here:
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=104&t=81490
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
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Full MOPAR skid plates
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AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997