A woman whose former FBI agent husband vanished five months ago while on a business trip to Iran said she is planning a trip there to search for him. Christine Levinson is ignoring the advice of the State Department against travel to Iran because she is convinced that Robert Levinson is still in the country, she said. "I am positive he is alive," the mother of seven told The Associated Press in an interview Thursday from her home in Coral Springs, Florida. "If he were hospitalized or had been killed, we would have known by now." Robert Levinson, who had been an FBI agent in New York and Florida and retired in 1998, was last seen March 8 on Kish Island, a resort off the southern coast of Iran, where he had gone to seek information on cigarette smuggling for a client of his security firm.