EXHIBIT 11 CROWN CASTLE INTERNATIONAL CORP. COMPUTATION OF NET LOSS PER COMMON SHARE (IN THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS) HISTORICAL PRO FORMA ------------------------------------- ----------- YEARS ENDED DECEMBER 31, YEAR ENDED ------------------------------------- DECEMBER 31, 1995 1996 1997 1998 1998 -------- ------ --------- -------- --------- Net loss.............................. $ (21) $ (957) $(11,942) $(37,775) $(119,018) Dividends on preferred stock.......... -- -- (2,199) (5,411) (26,745) ------ ----- -------- -------- --------- Net loss applicable to common stock for basic and diluted computations......................... $ (21) $ (957) $(14,141) $(43,186) $(145,763) ====== ===== ======== ======== ========= Weighted-average number of common shares outstanding during the period for basic and diluted computations (in thousands)....................... 3,316 3,503 6,238 42,518 142,213 ====== ===== ======== ======== ========= Loss per common share-- basic and diluted.................... $(0.01) $(0.27) $ (2.27) $ (1.02) $ (1.02) ====== ===== ======== ======== =========