Thanks to you all.
I've determined to forget about the Sirius radio tuner for over $300. I can live without satellite radio and use CDs.
Here's my take on the radio.
When Sirius and XM merged, Jensen had a surplus of Sirius radios and dumped them in the RV industry and jacked up the price for the tuner. That explains why the Sirius tuner is $300 and the Sirius/XM tuner is $30. They perform the same function but the Sirius radio owners pay extra to activate.
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