CONCENTRATION OF CREDIT RISK

9 Months Ended

Sep. 30, 2012

CONCENTRATION OF CREDIT RISK

15. CONCENTRATION OF CREDIT RISK

The Company’s credit risks arise from accounts receivable with international, national, regional and local wireless service providers and federal and state government agencies. The Company performs periodic credit evaluations of its customers’ financial condition and provides allowances for doubtful accounts, as required, based upon factors surrounding the credit risk of specific customers, historical trends and other information. The Company generally does not require collateral.

The following is a list of significant customers (representing at least 10% of revenue for the periods reported) and the percentage of total revenue for the specified time periods derived from such customers:

Site Leasing Revenue	For the three months ended September 30,						For the nine months ended September 30,
	2012			2011			2012			2011
AT&T		23.0	%		27.0	%		23.8	%		27.0	%
Sprint		22.0	%		21.8	%		22.7	%		22.1	%
T-Mobile		15.4	%		11.2	%		13.9	%		11.3	%
Verizon		13.3	%		15.7	%		13.7	%		15.6	%
Site Development Consulting Revenue	For the three months ended September 30,						For the nine months ended September 30,
	2012			2011			2012			2011
Ericsson, Inc		17.6	%		0.3	%		20.6	%		0.9	%
Alcatel-Lucent		10.7	%		0.0	%		10.0	%		0.0	%
Verizon		9.8	%		18.0	%		12.0	%		17.4	%
Nsoro		5.9	%		4.0	%		6.1	%		10.7	%
T-Mobile		2.6	%		10.3	%		5.7	%		9.3	%
Site Development Construction Revenue	For the three months ended September 30,						For the nine months ended September 30,
	2012			2011			2012			2011
Ericsson, Inc		26.9	%		6.4	%		19.2	%		8.5	%
Nsoro Mastec		23.5	%		48.0	%		26.5	%		43.4	%
Overland Contracting		10.9	%		5.6	%		9.5	%		7.0	%

At September 30, 2012, five significant customers comprised 51.4% of total gross accounts receivable compared to five significant customers which comprised 50.4% of total gross accounts receivable at December 31, 2011.