Cooperative Housing Society, defines the activities that can be carried out in the Society premises (ONLY if conveyance of society premises is done). Commercial earning by way of installing a Mobile phone Tower, is certainly not amongst them.
Even if ALL the society members agree to the issue, then too the commercial mobile tower cannot be installed on the society building premises, since it will violate the provisions of the socities Act. Even an outsider will be able to file a case for violation of the laws of the land.
Even if one member objects, then the above should not be done, in a coop hsg. society. There can be more than half a dozen different cases filed under different Acts on the above matter in different courts and the society will be embroiled in several court cases.
A commercial structure (or say a non commercial structure like a coop. hsg. society building) can install the mobile tower after taking due permission for the Civic authorities and the Fire brigade authorites and the police authorities.
Keep Smiling ... HemantAgarwal