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Purchased an XM Onyx for my father for a Christmas present. Due to area radio saturation, he could not keep listening to anything he chose. Adding this into his radio system has allowed him to use the XM as it was intended. Highly recommended for anyone using an XM Onyx, no constant need to search of open air.
What's great about it: Eliminates constant searching for empty air space
What's not so great: Should be standard with Onyx purchase, not an accessory