Hi,
the antenna WS-AI-DX02360 is not certified for the AP36xx series - so you can't use it with this AP model.
You'd use the antenna on the AP3825 BUT it's a six-feed antenna = from the antenna you've 6 cables (already attached to the antenna) that you'd need to connect to the AP.
If you connect only one of the antenna cables to the AP you don't get dual-radio support and also only one rx/tx antenna with one stream.
http://learn.extremenetworks.com/rs/extreme/images/3825ie-Indoor-Access-Point-DS.pdf
WS-AI-DX02360 Indoor, 2.4GHz/5GHz, Six-feed, 2/2 dBi, Omni, Ceiling
-Ron
PS: It would be great if Extreme could provide a detailed phote of every antenna they sell on the web - I haven't found anything for this antenna model....