EXHIBIT 11.1 CROWN CASTLE INTERNATIONAL CORP. COMPUTATION OF NET LOSS PER COMMON SHARE (IN THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS) THREE MONTHS ENDED MARCH 31, -------------------- 2002 2003 --------- -------- Loss before cumulative effect of change in accounting principle............................ $(103,393) $(66,981) Dividends on preferred stock..................... (20,105) (14,371) --------- -------- Loss before cumulative effect of change in accounting principle applicable to common stock for basic and diluted computations.............. (123,498) (81,352) Cumulative effect of change in accounting principle....................................... -- (2,035) --------- -------- Net loss applicable to common stock for basic and diluted computations............................ $(123,498) $(83,387) ========= ======== Weighted-average number of common shares outstanding during the period for basic and diluted computations (in thousands)............. 219,420 216,958 ========= ======== Per common share--basic and diluted: Loss before cumulative effect of change in accounting principle........................... $ (0.56) $ (0.37) Cumulative effect of change in accounting principle...................................... -- (0.01) --------- -------- Net loss........................................ $ (0.56) $ (0.38) ========= ========