Understanding External Antenna Deployments
Figure 45
Figure 46
Cisco Aironet Series 1600/2600/3600 Access Point Deployment Guide, Release 7.5
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6 dBi patch antenna – while not critical, ideally port "A" and "B" would be on the ends.
AP 1600 Note port "A" is spaced furthest from "B" and "C" for best diversity