not saying how accurate this is, but in the past there was a discussion about the rooftop antenna. Seems the lariat w/lux vehicles have a slightly different antenna that is used for XM, GPS, Cell, AM/FM. Maybe a swap out of the antenna, run an XM cable, etc., probably alot of work. (just throwing it out there as a thought, since Blue1005 sorta mentioned XM above) Hopefully i didnt mis-interpret.....
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