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 Six Months Ended June 30, June 30, ------------------- -------------------- 1997 1998 1997 1998 ------- ------- ------- -------- (In thousands of dollars, except per share amounts) Net loss $(1,706) $(6,426) $(2,149) $(13,032) Dividends on Senior Convertible Preferred Stock - (2,077) - (4,132) ------- ------- ------- -------- Net loss applicable to common stock for basic and diluted computations $(1,706) $(8,503) $(2,149) $(17,164) ======= ======= ======= ======== Weighted-average number of common shares outstanding during the period for basic and diluted 3,362 10,954 3,381 10,954 computations (in thousands) ======= ======= ======= ======== Loss per common share - basic and diluted $ (0.51) $ (0.78) $ (0.64) $ (1.57) ======= ======= ======= ========