Exhibit 12.1

XM Satellite Radio Holdings Inc. and Subsidiaries

Earnings to Fixed Charges

Earnings to Fixed Charges and Preferred Stock Dividends

As defined
by Regulation S-K: Item 503(d)





|                                                                               |  |                                |   |  |                                     |   |                  |        |   |                                        |        |   |  |        |   |  |  |  |          |  
|------------------------------------------------------------------------------ |  | ------------------------------ | - |  | ----------------------------------- | - | ---------------- | ------ | - | -------------------------------------- | ------ | - |  | ------ | - |  |  |  | -------- | -
|                                                                               |  | Predecessor Entity             |   |  |                                     |   | Successor Entity |       
|(in millions, except ratios)                                                   |  | Fiscal Year Ended December 31, |   |  | January 1, 2008ThroughJuly 31, 2008 |   |                  |        |   | August 1, 2008ThroughDecember 31, 2008 |       
|                                                                               |  | 2004                           |   |  | 2005                                |   |                  | 2006   |   |                                        | 2007   |   |  |        |  
|Earnings:                                                                      |  |                                |   |  |                                     |   |                  |        |   |                                        |        |   |  |        |   |  |  |  |          |  
|Pretax income from continuing operations                                       |  | (615.1                         | ) |  | (664.4                              | ) |                  | (718.9 | ) |                                        | (683.3 | ) |  | (320.9 | ) |  |  |  | (6,437.2 | )
|Minority Interest                                                              |  |                               |   |  |                                    |   |                  |       |   |                                        | 11.5   |   |  |       |   |  |  |  |         |  
|Equity method losses                                                           |  |                               |   |  | 0.5                                 |   |                  | 23.2   |   |                                        | 16.5   |   |  | 13.0   |   |  |  |  | 25.8     |  
|Interest expense, net of amounts capitalized                                   |  | 85.8                           |   |  | 107.8                               |   |                  | 121.3  |   |                                        | 116.6  |   |  | 73.9   |   |  |  |  | 107.2    |  
|Amortization of capitalized interest                                           |  | 11.1                           |   |  | 14.2                                |   |                  | 22.3   |   |                                        | 16.0   |   |  | 9.4    |   |  |  |  |         |  
|Estimate of the interest component of rent expense                             |  | 1.8                            |   |  | 2.0                                 |   |                  | 2.3    |   |                                        | 2.0    |   |  | 1.6    |   |  |  |  | 1.1      |  
|Total Earnings                                                                 |  | (516.4                         | ) |  | (539.9                              | ) |                  | (556.1 | ) |                                        | (520.7 | ) |  | (223.0 | ) |  |  |  | (6,303.1 | )
|                                                                               |  |                                |   |  |                                     |   |                  |        |   |                                        |        |   |  |        |   |  |  |  |          |  
|                                                                               |  |                                |   |  |                                     |   |                 
|Fixed Charges:                                                                 |  |                                |   |  |                                     |   |                  |        |   |                                        |        |   |  |        |   |  |  |  |          |  
|Interest expense, net of amounts capitalized                                   |  | 85.8                           |   |  | 107.8                               |   |                  | 121.3  |   |                                        | 116.6  |   |  | 73.9   |   |  |  |  | 107.2    |  
|Capitalized interest                                                           |  | 31.8                           |   |  | 24.1                                |   |                  | 16.0   |   |                                        | 7.1    |   |  | 6.9    |   |  |  |  | 10.7     |  
|Estimate of the interest component of rent expense                             |  | 1.8                            |   |  | 2.0                                 |   |                  | 2.3    |   |                                        | 2.0    |   |  | 1.6    |   |  |  |  | 1.1      |  
|                                                                               |  |                                |   |  |                                     |   |                  |        |   |                                        |        |   |  |        |   |  |  |  |          |  
|Total Fixed Charges                                                            |  | 119.4                          |   |  | 133.9                               |   |                  | 145.9  |   |                                        | 125.7  |   |  | 82.4   |   |  |  |  | 119.0    |  
|                                                                               |  |                                |   |  |                                     |   |                  |        |   |                                        |        |   |  |        |   |  |  |  |          |  
|                                                                               |  |                                |   |  |                                     |   |                 
|Ratio of Earnings to Fixed Charges (1)                                         |  |                               |   |  |                                    |   |                  |       |   |                                        |       |   |  |       |   |  |  |  |         |  
|Deficiency in Earnings to Fixed Charges                                        |  | 635.8                          |   |  | 673.8                               |   |                  | 702.0  |   |                                        | 646.4  |   |  | 305.4  |   |  |  |  | 6,422.1  |  
|                                                                               |  |                                |   |  |                                     |   |                 
|Fixed Charges and Preferred Stock Dividends:                                   |  |                                |   |  |                                     |   |                  |        |   |                                        |        |   |  |        |   |  |  |  |          |  
|Fixed Charges                                                                  |  | 119.4                          |   |  | 133.9                               |   |                  | 145.9  |   |                                        | 125.7  |   |  | 82.4   |   |  |  |  | 119.0    |  
|Preferred dividend requirements                                                |  | 8.8                            |   |  | 8.6                                 |   |                  | 12.8   |   |                                        |       |   |  |       |   |  |  |  |         |  
|                                                                               |  |                                |   |  |                                     |   |                  |        |   |                                        |        |   |  |        |   |  |  |  |          |  
|Total Fixed Charges and Preferred Stock Dividends                              |  | 128.2                          |   |  | 142.5                               |   |                  | 158.7  |   |                                        | 125.7  |   |  | 82.4   |   |  |  |  | 119.0    |  
|                                                                               |  |                                |   |  |                                     |   |                  |        |   |                                        |        |   |  |        |   |  |  |  |          |  
|                                                                               |  |                                |   |  |                                     |   |                 
|Ratio of Earnings to combined Fixed Charges and Preferred Stock Dividends (2)  |  |                               |   |  |                                    |   |                  |       |   |                                        |       |   |  |       |   |  |  |  |         |  
|Deficiency of Earnings to combined Fixed Charges and Preferred Stock Dividends |  | 644.6                          |   |  | 682.4                               |   |                  | 714.8  |   |                                        | 646.4  |   |  | 305.4  |   |  |  |  | 6,422.1  |  



|(1) | No figure is provided for any period during which the applicable ratio was less than 1.00. Therefore earnings available for fixed charges were inadequate to cover fixed charges for
these periods.
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|(2) | No figure is provided for any period during which the applicable ratio was less than 1.00. Therefore earnings available for fixed charges and preferred stock dividends were
inadequate to cover fixed charges and preferred stock dividends for these periods.
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