Rooftop Antennas

I know there are a rules and regulations governing the installation of rooftop antennas...rules regarding the maximum allowable height of the antenna, methods of installation, grounding, etc. I know that coop boards, homeowner associations and similar groups are sometimes the source of these rules, but some rules...at least if I'm not mistaken...originate with the city.

Can anyone tell me where to find out about these rules? I have scoured the NYC.gov site looking for zoning ordinances that might be relevant, but thus far have turned up absolutely nothing.

Thanks!