There was a old post from 2017 - regarding the tower companies of India. However after Jio's entry with 4G in 2016 the scenario of Indian Telecom had changed a lot. As the mobile service providers saw ruthless merger and acquisition, the same came for tower space too.
At present there are only handful of tower companies in India - top three companies are Summit Digitel, Indus Towers, American Tower Co. , just like the three pvt. telecom service providers - Jio, Airtel and Vi. Though in this space there are few smaller players survived - GTL, Aster.