SLK/R171: Cellular Antenna Placement
Whether the car is equipped with the optional hands-free communication system or not, the antenna is hidden, and already present (not "or"). Like nearly every US-spec Mercedes car in recent times, the antennas are behind the rear bumper panel. (I believe the G-class is the only car which deviates from this pattern, having the main phone antenna on the roof and the main TeleAid antenna in the rear bumper; nearly every other car only uses the bumper antennas as the backup antenna for TeleAid.)
Because the way antennas plug into the antenna switch, it is very easy to reconfigure the antennas to reverse their roles... the primary phone antenna can be on the roof and the primary TA antenna in the bumpers, with TA still having access to the roof antenna as a backup. This may be preferable depending on which system you use more, or if you even subscribe to TA.
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Have you seen the new SIRIUS antennas? They are quite small, very similar to the TeleAid antenna on the R170.
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If you plan to install the phone yourself, make sure you have a reverse Torx (E10) socket ready.
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