Exhibit 1.1



                           SIRIUS SATELLITE RADIO INC.
                            (A Delaware corporation)

                        25,000,000 Shares of Common Stock



                                 TERMS AGREEMENT
                                 ---------------

                                                                 October 7, 2004


To:      Sirius Satellite Radio Inc.
         1221 Avenue of the Americas, 36th Floor
         New York, New York 10020


Ladies and Gentlemen:

                  This is a Terms Agreement referenced in the Form Underwriting
Agreement attached hereto, as contemplated by the Registration Statement No.
333-108387. The terms of the Form Underwriting Agreement are hereby incorporated
herein. We understand that Sirius Satellite Radio Inc., a Delaware corporation
(the "Company"), proposes to issue and sell 25,000,000 shares of its common
stock, par value $.001 per share (the "Underwritten Securities"). Subject to the
terms and conditions set forth or incorporated by reference herein, Morgan
Stanley & Co. Incorporated (the "Underwriter") offers to purchase the total
aggregate number of Underwritten Securities, and some or all of the Option
Underwritten Securities set forth below, to the extent any Underwritten
Securities or Option Underwritten Securities are purchased in accordance with
the terms hereof.










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         The Underwritten Securities shall have the following terms:




                                           Common Stock
                                           ------------
                           
Title:                        Common Stock, par value $.001 per share.

Number of Shares:             25,000,000

Number of Option              The Underwriter has an option to purchase up to an
Underwritten Securities:      additional 3,750,000 shares of Underwritten
                              Securities (the "Option Underwritten Securities")
                              at the purchase price set forth below, within
                              30 days from the Closing Date to cover over-allotments.

Purchase price:               $3.85 per share.

Listing requirements:         Nasdaq National Market.

Lock-up provisions:           For a period of 90 days from the date of the
                              Prospectus Supplement relating to the Underwritten
                              Securities, the Company will not, without the
                              prior written consent of the Underwriter, (1)
                              offer, pledge, sell, contract to sell, sell any
                              option or contract to purchase, purchase any
                              option or contract to sell, grant any option,
                              right or warrant to purchase, lend, or otherwise
                              transfer or dispose of, directly or indirectly,
                              any shares of common stock or any securities
                              convertible into or exercisable or exchangeable
                              for common stock or (2) enter into any swap or
                              other arrangement that transfers to another, in
                              whole or in part, any of the economic consequences
                              of ownership of the common stock, whether any such
                              transaction described in clause (1) or (2) above
                              is to be settled by delivery of common stock or
                              such other securities, in cash or otherwise, or
                              (3) file or cause to become effective a
                              registration statement relating to the offer and
                              sale of any shares of common stock or any
                              securities convertible into or exercisable or
                              exchangeable for common stock, other than (i)
                              shares of stock that may be issued in connection
                              with the Company's long-term stock incentive plan
                              or 401(k) plan or (ii) amendments to the Company's
                              registration statement on Form S-3 (File No.
                              333-115695) as are necessary to permit holders of
                              the Company's 2 1/2% Convertible Notes due 2009
                              (issued on February 20, 2004) to resell those
                              securities or the underlying common stock in a
                              registered transaction.












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                              The foregoing sentence shall not apply to (a) the
                              sale of any Underwritten Securities to the
                              Underwriter pursuant to the Form Underwriting
                              Agreement and this Terms Agreement, (b)
                              transactions relating to shares of common stock or
                              other securities acquired in open market
                              transactions after the completion of the Public
                              Offering or (c) the issuance by the Company of
                              additional options under the Company's existing
                              stock option plans, provided that such options are
                              not exercisable during such 90-day period.

Comfort Letter:               The Company shall cause the Accountant's Comfort
                              Letter and the Bring-down Comfort Letter
                              referenced in, respectively Section 5(g) and
                              Section 5(h) of the Form Underwriting Agreement to
                              be delivered, except that such letters will be
                              delivered by Ernst & Young LLP in lieu of Arthur
                              Andersen LLP.

Additional Representations    The Company represents and warrants to and
of the Company:               agrees with the Underwriter that there are no
                              contracts, agreements or understandings between
                              the Company and any person granting such person
                              the right to require the Company to file a
                              registration statement under the Securities Act
                              with respect to any securities of the Company or
                              to require the Company to include such securities
                              with the Underwritten Securities registered
                              pursuant to the Registration Statement, other than
                              the agreements granting registration rights to
                              affiliates of The Blackstone Group L.P. and Apollo
                              Management, L.P.

Additional Covenants of the   The Company covenants with the Underwriter whether
Company:                      or not the transactions contemplated in this
                              Agreement are consummated or this Agreement is
                              terminated, to pay or cause to be paid all
                              expenses incident to the performance of its
                              obligations under this Agreement, including: (i)
                              the cost of printing or producing any Blue Sky or
                              Legal Investment memorandum in connection with the
                              offer and sale of the Underwritten Securities
                              under state securities laws and all expenses in
                              connection with the qualification of the
                              Securities for offer and sale under state
                              securities laws as provided in Section 3(f) of the
                              Form Underwriting Agreement, including filing fees
                              and the reasonable fees and disbursements of
                              counsel for the Underwriter in connection with
                              such qualification and in connection with the Blue
                              Sky or Legal Investment memorandum, (ii) the cost
                              of printing certificates













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                              representing the Underwritten Securities, (iii)
                              the costs and charges of any transfer agent,
                              registrar or depositary, (iv) the document
                              production charges and expenses associated with
                              printing this Agreement and (v) all other costs
                              and expenses incident to the performance of the
                              obligations of the Company hereunder for which
                              provision is not otherwise made in this Section.
                              It is understood, however, that except as provided
                              in Sections 4, 6 and 7 of the Form Underwriting
                              Agreement, "Additional Covenants of the Company"
                              and "Additional Termination Provisions" below, the
                              Underwriter will pay all of its costs and
                              expenses, including fees and disbursements of its
                              counsel, stock transfer taxes payable on resale of
                              any of the Underwritten Securities by it and any
                              advertising expenses connected with any offers it
                              may make.

Additional Conditions of      The obligations of the Underwriter to purchase and pay
Underwriter's Obligations:    for the Underwritten Securities pursuant this Terms
                              Agreement are subject to the following further
                              conditions: subsequent to execution and delivery
                              of this Terms Agreement and prior to the Closing
                              Date there shall not have occurred any change, or
                              any development involving a prospective change, in
                              the condition, financial or otherwise, or in the
                              earnings, business or operations of the Company
                              and its subsidiaries, taken as a whole, from that
                              set forth in the Prospectus (exclusive of any
                              amendments or supplements thereto subsequent to
                              the date of this Agreement) that, in the
                              Underwriter's judgment, is material and adverse
                              and that makes it, in the Underwriter's judgment,
                              impracticable to market the Underwritten
                              Securities on the terms and in the manner
                              contemplated in the Prospectus.

Additional Termination        The Underwriter may terminate this Terms
Provisions:                   Agreement, by notice to the Company at any time at
                              or prior to the Closing Date if (i) trading is
                              suspended or materially limited on, or by, as the
                              case may be, any of the Chicago Board of Options
                              Exchange, the Chicago Mercantile Exchange or the
                              Chicago Board of Trade, (ii) a material disruption
                              in securities settlement, payment or clearance
                              services in the United States shall have occurred,
                              or (iii) there shall have occurred any outbreak or
                              escalation of hostilities, or any change in
                              financial markets or any calamity or crisis that,
                              in the Underwriter's judgment, is material and
                              adverse and which, singly or together with











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                              any other event specified in this clause (iii),
                              makes it, in the Underwriter's judgment,
                              impracticable or inadvisable to proceed with the
                              offer, sale or delivery of the Underwritten
                              Securities on the terms and in the manner
                              contemplated in the Prospectus.

                              If this Terms Agreement shall be terminated by the
                              Underwriter because of any failure or refusal on
                              the part of the Company to comply with the terms
                              or to fulfill any of the conditions of this Terms
                              Agreement, or if for any reason the Company shall
                              be unable to perform its obligations under this
                              Terms Agreement, the Company will reimburse the
                              Underwriter for all out-of-pocket expenses
                              (including the fees and disbursements of its
                              counsel) reasonably incurred by the Underwriter in
                              connection with this Terms Agreement or the
                              offering contemplated hereunder.

Additional Indemnification    The Company agrees to indemnify and hold harmless
Provisions:                   each affiliate of the Underwriter within the
                              meaning of Rule 405 under the 1933 Act.


Other Terms:                  This Terms Agreement may be signed in
                              counterparts, each of which shall be an original,
                              with the same effect as if the signatures thereto
                              and hereto were upon the same instrument.

Notices:                      All notices and other communications hereunder
                              shall be in writing and shall be deemed to have
                              been duly given if mailed or transmitted by any
                              standard form of telecommunication. Notices to the
                              Underwriter shall be directed to Morgan Stanley &
                              Co. Incorporated, 1585 Broadway, New York, NY
                              10036, Attention: Global Capital Markets Syndicate
                              Desk; notices to the Company shall be directed to
                              the Company at 1221 Avenue of the Americas, 36th
                              Floor, New York, New York 10020, Attention:
                              Patrick L. Donnelly, Executive Vice President,
                              General Counsel and Secretary.

Closing Date and location:    October 13, 2004
                              10:00 a.m.
                              Cravath, Swaine & Moore LLP
                              Worldwide Plaza
                              825 Eighth Avenue
                              New York, NY 10019-7475












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                  Please accept this offer by signing a copy of this Terms
Agreement in the space set forth below and returning the signed copy to us.

                                                     Very truly yours,

                                                     MORGAN STANLEY & CO.
                                                       INCORPORATED

                                                       by
                                                           /s/ James C. Murray
                                                           --------------------
                                                               James C. Murray
                                                               Vice President



Accepted:

SIRIUS SATELLITE RADIO INC.

     by
           /s/ Patrick L. Donnelly
           ---------------------------------
               Patrick L. Donnelly
               Executive Vice President,
               General Counsel and Secretary