DALLAS (AP) _ Dallas-based Gulf Broadcast Co. has purchased a pair of television stations in suburban Arlington and Houston for $158 million after agreeing to divest itself of two radio stations in the same areas.

The purchase of KTXA-TV (Channel 21) in Arlington and KTXH-TV (Channel 20) in Houston was announced by the company Wednesday, and follows approval of the deal last month by the Federal Communications Commission.

As part of FCC's approval, Gulf Broadcast must sell KTXQ-FM in Dallas and KLTR-FM in Houston within 18 months.

The sale adheres to a long-standing FCC policy limiting common ownership of radio and television stations in the same market.

Gulf Broadcast had argued that radio and television stations are so numerous in the Dallas and Houston areas that common ownership would not adversely affect the competition or the diversity of media.

The company also said economies of scale brought by a joint operation would allow better public affairs programming.

But the FCC found that programming by itself does not outweigh the concern with concentration of media ownership in Houston, Dallas and other market areas.