Thanks all for your inputs.
@NiHaoMike,
The picture was captured from a Youtube video mentioning power shortage in China.
Your explanation appears to be the most plausible so far. Judging from the many stacks of HV bushings, the voltage could be 1000KV or higher. The horn of the device seems tilted up at a particular angle to enable the transmission of both power and data to and fro. I believe it is a sensor of some sort, and is powered by incoming microwave energy while also sending back data.