EXHIBIT 12.1 CROWN CASTLE INTERNATIONAL CORP. COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES AND EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS (DOLLARS IN THOUSANDS) NINE MONTHS ENDED SEPTEMBER 30, ----------------------- 1999 2000 -------- --------- Computation of Earnings: Income (loss) before income taxes, minority interests, extraordinary item and cumulative effect of change in accounting principle $ (59,935) $(142,286) Add: Fixed charges (as computed below) 83,319 188,387 --------- --------- $ 23,384 $ 46,101 ========= ========= Computation of Fixed Charges and Combined Fixed Charges and Preferred Stock Dividends: Interest expense $ 41,110 $ 114,182 Amortization of deferred financing costs and discounts on long-term debt 31,238 59,805 Interest component of operating lease expense 10,971 14,400 --------- --------- Fixed charges 83,319 188,387 Preferred stock dividends 19,846 39,571 --------- --------- Combined fixed charges and preferred stock dividends $ 103,165 $ 227,958 ========= ========= Ratio of Earnings to Fixed Charges -- -- ========= ========= Deficiency of Earnings to Cover Fixed Charges $ 59,935 $ 142,286 ========= ========= Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends -- -- ========= ========= Deficiency of Earnings to Cover Combined Fixed Charges and Preferred Stock Dividends $ 79,781 $ 181,857 ========= =========