(a) The charges made for legal advertisements on broadcast shall not exceed the comparable rate charged by the station to commercial customers.

(b) Any contract rates or volume discounts given to commercial customers by the station shall be available to persons or political subdivisions causing broadcast of legal advertisements, under the same terms and conditions as for commercial advertisements.

(c) As used in this section, “legal advertisement” and “political subdivision” have the meanings provided in Kan. Stat. Ann. §§ 28-137b and amendments thereto.