I have a 2010 Jayco Precept class-C. This may/may not be equipped with the same radio unit in your 2011 model.
My radio unit with camera, DVD, touch screen, etc. is the following:
Magnadyne, model M1-LCD. The operators manual lists the various optional components, for GPS, Sirius radio, etc.
In regards to the Sirius radio components. the following optional items are needed: Sirius Receiver SC-C1M and Sirius Antenna M9SIR-ANT-WP.
The "secret" telephone number for Magnadyne Corporation is (310) 884-7777. They do NOT like to deal with the consumer and try to refer you to a distributor. They are NOT consumer friendly! If you ask to speak with a technician, they are usually "out" in the field and the switchborad operator offers to assist you with technical problems.
Their office is located at 1111 W. Victoria Street, Compton, Calif. 90220.
I can only presume you will be referred to a distributor for the components you need.