Filmmakers Ketan Mehta and Anubhav Sinha have teamed up for 'Freedom Radio', an upcoming film based on the life of freedom fighter Usha Mehta. It'll be helmed by Ketan, while Anubhav will be producing it under his production banner Benaras Mediaworks. Usha Mehta started a radio station, Secret Congress Radio, during the Quit India Movement in 1942.