Will Delhi HC ruling applies in Karnataka

yes, but most of the courts pressed for local rulling. It is not mandatory to concede for other state judgemnt.

No.. However, it will have persuasive value and can be referred in argument ...

The judgments of other high courts are persuasive in nature. They are not binding precedents; Yet the courts will take note of the ratio laid down therein and not simply throw away stating that they are not of our high court. If there is contrary judgemnt of Karnataka High court, then the judgment of Dehli High court is not binding.

even without citation there are sufficient provisons in IPC.First approach the local body about permission , if given apply for revocation and if not complied to court.

First of all consider about mutual relations with your neighbour.If you still want to fight then file an application under RTI Act to Municipal authority and seek copy of"Permission to install the tower".It would provide you the basic information and then you should proceed further.

The Municipal Council/Corporation publishes advt. in local papers to seek objections,if any, to persons residing in the area.You should ask for the copy of advertisement published .

Bear in mind that information asked for by you must be in simple language as questioning is not allowed.You directly ask for the information duly certified.