SUPPLEMENTAL INDENTURE, dated as of January 12, 2011, among SIRIUS XM RADIO INC., a
Delaware corporation (the Company), XM EQUIPMENT LEASING LLC, a Delaware limited
liability company and indirect wholly-owned subsidiary of the Company (Equipment
Leasing), XM 1500 ECKINGTON LLC, a Delaware limited liability company and indirect
wholly-owned subsidiary of the Company (Eckington), XM INVESTMENT LLC, a Delaware limited
liability company and indirect wholly-owned subsidiary of the Company (Investment), XM
RADIO INC., a Delaware corporation and indirect wholly-owned subsidiary of the Company (XM
Radio), XM EMALL INC., a Delaware corporation and indirect wholly-owned subsidiary of the
Company (EMall), XM CAPITAL RESOURCES INC., a Delaware corporation and indirect
wholly-owned subsidiary of the Company (Capital Resources), XM INNOVATIONS INC., a
Delaware corporation and indirect wholly-owned subsidiary of the Company (Innovations),
EFFANEL MUSIC, INC., a New York corporation and indirect wholly-owned subsidiary of the Company
(with Equipment Leasing, Eckington, Investment, XM Radio, EMall, Capital Resources and Innovations,
each an Additional Guarantor), the other Guarantors and U.S. BANK NATIONAL ASSOCIATION,
as trustee (the Trustee). Capitalized terms used herein without definition will have the
meanings assigned to them in the Indenture (defined below).
WHEREAS, the Company has heretofore executed and delivered to the Trustee an indenture (as
amended or supplemented from time to time, the Indenture), dated as of August 24, 2009,
in connection with the issuance of 9.75% Senior Secured Notes due 2015 (the Notes);
WHEREAS, Section 10.06 of the Indenture provides that certain Persons shall execute and
deliver to the Trustee a supplemental indenture pursuant to which such Person shall become a
Guarantor and unconditionally guarantee the Companys Obligations under the Notes and the Indenture
on the terms and conditions set forth herein (the Note Guarantee);
WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and
deliver this Supplemental Indenture
NOW, THEREFORE, in consideration of the foregoing and for other good and valuable
consideration, the receipt of which is hereby acknowledged, each Guarantor, each Additional
Guarantor and the Trustee mutually covenant and agree for the equal and ratable benefit of the
Holders as follows:
1. AGREEMENT TO GUARANTEE. Each Additional Guarantor hereby agrees to provide an
unconditional Guarantee on the terms and subject to the conditions set forth in the Note Guarantee
and in the Indenture including but not limited to Article 10 thereof.
2. NO RECOURSE AGAINST OTHERS. No past, present or future director, officer, employee,
incorporator, stockholder or agent of each Guarantor or Additional Guarantor, as such, will have
any liability for any obligations of the Company or any Guarantor or any Additional Guarantor under
the Notes, any Note Guarantees, the Indenture or this Supplemental Indenture or for any claim based
on, in respect of, or by reason of, such obligations or their creation. Each Holder of the Notes
by accepting a Note waives and releases all such liability. The waiver and release are part of the
consideration for issuance of the Notes.
3. GOVERNING LAW. This Supplemental Indenture and the Notes shall be governed by, and
construed in accordance with, the laws of the State of New York.
4. COUNTERPARTS. The parties may sign any number of copies of this Supplemental Indenture.
Each signed copy will be an original, but all of them together represent the same agreement.
5. EFFECT OF HEADINGS. The Section headings herein are for convenience only and will not
affect the construction hereof.
6. THE TRUSTEE. The Trustee will not be responsible in any manner whatsoever for or in
respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the
recitals contained herein, all of which recitals are made solely by each Guarantor, each Additional
Guarantor and the Company.
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