Cisco Aironet 2700 Series - Outdoor Antenna Lead Orientation and Weatherproofing; Outdoor Antenna Lead Downward Mounting; Using Coax-Seal for Weatherproofing Antenna Connectors

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Cisco Aironet Series 2700/3700 Access Points Deployment Guide
Cisco Aironet Series 2700 Access Point
Figure 101 Always Mount Antennas Outdoors with Leads DOWN (Indoors Does not Matter)
Figure 102 If Antenna Connectors are Exposed to Weather – Coax-Seal Should be Used but if
Present, Do Not Cover Antenna Drain Holes.