Cisco AIR-LAP1252AG-A-K9 - Aironet 1252AG - Wireless Access Point Software Configuration Manual page 68

Radio Configuration
•
The access point receives and transmits using one antenna at a time, so you cannot
Note
increase range by installing high-gain antennas on both connectors and pointing
one north and one south. When the access point used the north-pointing antenna,
it would ignore client devices to the south.
Cisco Aironet 1200 Series Access Point Software Configuration Guide
3-30
Left—If your access point has removeable antennas and you install a
high-gain antenna on the access point's left connector, you should use this
setting for both receive and transmit. When you look at the access point's
back panel, the left antenna is on the left.
Chapter 3 Configuration
OL-2159-03