EXHIBIT 11 VANGUARD CELLULAR SYSTEMS, INC. AND SUBSIDIARIES CALCULATION OF DILUTED EARNINGS PER SHARE (Amounts in thousands, except per share data) THREE MONTHS ENDED MARCH 31, - --------------------------------------------------------------------------------------------------------- 1998 1997 - --------------------------------------------------------------------------------------------------------- Net Income (Loss) $ (20,729) $ 228 - --------------------------------------------------------------------------------------------------------- Weighted average number of common shares outstanding 37,844 40,824 Adjustments necessary to reflect weighted average number of common shares outstanding on a diluted basis 647 57 - --------------------------------------------------------------------------------------------------------- 38,491 40,881 - --------------------------------------------------------------------------------------------------------- Diluted net income (loss) per common share $ (0.54) $ 0.01 - ---------------------------------------------------------------------------------------------------------