Question about Antenna Gain

Dear Frends,
Could any one can explain me the usage of "Antenna Gain" field in Cisco WLC software v4.2 (Go to Wireless > Accesspoints> radios >802.11b/g/n Cisco APs > Configure - page in Gui)
if i'm using an 2.2Dbi cisco antenna, which value should i mention there? 2.2 or 4.4 ?
Anybody can suggest me any white paper or any documents regarding the mentioned page ?
Thanks in advance
Raj

You would use the gain of your antenna, 2.2dBi.
Just because there are two antennas does not mean the value doubles. The other antenna is for diversity purposes; in the event a signal recieved is weaker due to a host of reasons, the other antenna is exactly 180 degrees out of phase of the first antenna and would most likely be in a better position to receive the strongest signal.
With diversity on, the AP constantly determines which antenna would be the best antenna at that moment in time to recieve signals. They flip on and off all the time.
The only way to increase gain would be to use a higher gain antenna. Depending on your original intent and your surrounding environment, this does not necessarily equate to better; sometimes it equates to worse.
You type it in so the WLC knows what you stuck on the end of the radio so it can act accordingly, supposedly.

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