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On older APs such as the 1220s and 1230s is there actually any benefit to have 2 antennas on a unit versus just one?
Thanks in advance. All replies rated
Sure there is. Multiple antennas let's the AP do diversity which will help mitigate multipath distortion.
Just to add a link to the great info from Dan (+5 points Dan!)
Have a look this good doc, it explains the benifits quite well;
Multipath and Diversity
Hope this helps!