It looks as if cable network RFD's decision to simulcast Don Imus's radio show will help it expand into markets that have heretofore been closed to it. Patrick Gottsch, the founder and president of the channel, has told the New York Times that he has signed carriage agreements with Comcast, the nation's largest cable operator, that could bring RFD to such cities as Baltimore, Detroit, Philadelphia, Seattle, Denver and Nashville. The Times said that Gottsch is also seeking a similar agreement with Time Warner Cable, which could put his show back on the air in such markets as New York City and Los Angeles.