Diversity antenna configuration is very important in system design. To achieve the better degree of diversity advantage, the separation requirement for a = 0o is much less than that for a = 90o . However, the mobile units travel around base station with no restriction in any direction a (i.e. 0o £ a £ 90o ). At a = 90o the separation is the same as the antenna height for a correlation coefficient of 0.7. The triangular configuration for the omnidirectional antennas arrangement overcome the difficulty of a = 90o.
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