Cisco Aironet 2700 Series - Poor AP Installation Examples and Antenna Orientation; High Mounting and Conductive Foil Installation Issues; Correct Dipole Antenna Orientation for Vertical Polarity; Reduced Coverage from Incorrect Antenna Orientation

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Cisco Aironet Series 2700/3700 Access Points Deployment Guide
Cisco Aironet Series 3700 Access Point
Figure 99 Example of a Poor Installation – Access Point is too High and Buried in Conductive Foil
Remember, the best place for an AP is as close to the users as possible. Avoid metal or conductive objects
in the near field (they cause the radio waves to become directional and increases nulls (dead spots)). If
you must mount the AP in a high ceiling, look at directional antennas to direct (angle down) the signal
to the intended target area and always mount dipoles in the correct orientation.
Figure 100 When Using Dipole Antennas Observe the Correct Orientation (Vertical Polarity)