How Can I Determine Orientation of Antennas?

A good signal coverage can be obtained if you place antennas with a correct polarization
direction. From the following figure, you can see that the gain of an AP's omnidirectional
antenna is the highest in the direction vertical to the antenna.

When an AP is placed horizontally or wall-mounted, the major lobes of antennas should be
placed vertically to receive the optimal signal coverageand then it will have the best
connection.