I tried to find the radiation pattern for the 1140 AP, but no luck so far.
Anybody knows where to find it or can send me a copy?
The radiating pattern of the 1140 should be the roughly the same with the 1130. Please refer to the following documents and scroll down to the 1130 for further information:
Cisco Aironet 1130 Series Integrated Antenna
Does this help?