Silex technology Multicast Video Distribution System MVDS X-1 - Manual (Page 36)

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MVDS X-1 User's Guide
Vertical convergence angle and minimum distance
Every 'high-gain' antenna has vertical and horizontal selectiveness. The narrower
the coverage, the higher the possible gain. However, this selectiveness also
creates 'blind spot' in close range, especially if antennas located in different
height.