Garmin GXM-30 (XM Satellite Radio Accessory)Strengths: Receives strong signal, Seamless functionality with compatible Garmin GPS's
Weaknesses: Price; Physically larger that a typical XM antennae
Summary: I use the GXM 30 with a Zumo 550 on my motorcycle. It works well and the addition of NavTraffic makes the complete system awesome. Be aware that the GXM 30 is not just an antennae but a completely self contained XM receiver (Hence the large price and size). Your XM subscription is attached to the GXM-30 not the GPS head unit, so if you use the GPS unit in multiple vehicles you'll have to move the GXM-30 as well to receive XM and NavTraffic.
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