They operate in the same frequency band, but not the same frequency. Its a patch antenna that is optimized for what its supposed to listen to.....and what its NOT supposed to listen to. An XM antenna is tuned for XM and the Sirius is tuned for Sirius. So you will not get the best performance. Just get the XM antenna, which in some cases is the antenna and low-noise amplifier in one package, once again all components tuned for what its supposed to receive and reject.
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