Hi Lorenzo,

You probably want to set the Left or Right Primary (I'm not on site right now so I can't see or remember) and take the setting out of Diversity;

Use the antenna configuration interface command to configure the radio receive or transmit antenna settings. Use the no form of this command to reset the receive antenna to defaults.

[no] antenna {receive | transmit} {diversity | left | right}

Syntax Description

receive

Specifies the antenna that the access uses to receive radio signals

transmit

Specifies the antenna that the access uses to transmit radio signals

diversity

Specifies the antenna with the best signal

left

Specifies the left antenna

right

Specifies the right antenna

Defaults

The default antenna configuration is diversity

Examples

This example shows how to specify the right receive antenna option:

AP(config-if)# antenna receive right

This example shows how to set the receive antenna option to defaults:

AP(config-if)# no antenna receive

From this doc;

http://www.cisco.com/en/US/products/hw/wireless/ps430/products_command_reference_chapter09186a0080147d8b.html#2448409

Hope this helps!

Rob