You can find on the following link:
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You didn't say that on the previous post.
But I don't believe it is different as this pattern is almost the same for most internal AP which uses 2.0 dBi for 2.4 and 4.0 dBi for 5.0 GHz.
I did, in fact, state "1815i" in both the title and the initial post. As one is meant to be mounted on a wall and somewhat directional and the other is intended to be mounted to a ceiling, I would think the pattern would be different. Also, I believe the antennas are mounted slightly differently on the 1815i than they are on the 1815w. I've included pictures of both the 1815w and 1815i internal antennas for clarification.
The radiation pattern can be found in the 1815i getting started guide: