It shall be unlawful for any person, firm or corporation acting in its own behalf or under a lease with or pole contract from any public utility to construct, install, operate or maintain a cable television service in, on, over, under, upon, across, from and along the streets, alleys, sidewalks, public property and public ways within the corporate limits of any city without first obtaining, from such city involved, a franchise authorizing the same under such reasonable conditions as the circumstances may require; and the governing bodies of such cities are hereby authorized to grant or extend one or more such franchises for a term of not to exceed twenty (20) years from the date of such grant or extension; and no person, firm or corporation shall ever be granted an exclusive franchise. No franchise shall be granted or extended unless a public hearing shall be held following at least one week’s notice in the official city newspaper.