EXHIBIT 11

CROWN CASTLE INTERNATIONAL CORP.

COMPUTATION OF NET INCOME (LOSS)

PER COMMON SHARE

(IN THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)

	Years Ended December 31,
	2004			2005			2006			2007			2008
Income (loss) from continuing operations	$	(300,864	)	$	(391,743	)	$	(47,550	)	$	(222,813	)	$	(48,858	)
Dividends on preferred stock		(38,618	)		(37,354	)		(20,806	)		(20,805	)		(20,806	)
Losses on purchases of preferred stock		—			(12,002	)		—			—			—
Income (loss) from continuing operations applicable to common stock for basic and diluted computations		(339,482	)		(441,099	)		(68,356	)		(243,618	)		(69,664	)
Income (loss) from discontinued operations		534,688			848			5,657			—			—
Cumulative effect of change in accounting principle		—			(9,031	)		—			—			—
Net income (loss) applicable to common stock for basic and diluted computations	$	195,206		$	(449,282	)	$	(62,699	)	$	(243,618	)	$	(69,664	)
Weighted-average number of common shares outstanding during the period for basic and diluted computations (in thousands)		221,693			217,759			207,245			279,937			282,007
Per common share—basic and diluted:
Income (loss) from continuing operations	$	(1.54	)	$	(2.02	)	$	(0.33	)	$	(0.87	)	$	(0.25	)
Income (loss) from discontinued operations		2.42			—			0.03			—			—
Cumulative effect of change in accounting principle		—			(0.04	)		—			—			—
Net income (loss)	$	0.88		$	(2.06	)	$	(0.30	)	$	(0.87	)	$	(0.25	)