The figure was released by the research department of the state-run Islamic Republic of Iran Broadcasting (IRIB), in what the daily 7 Sobh said was a rare admittance of the popularity of satellite channels in Iran.
According to the report, 42 per cent of more than 75 million Iranians spend approximately three hours watching these channels, which air movies, music and other entertainment programmes as well as news, mostly in Persian, including the BBC's Persian service and the US channel Voice of America.
Cooperation with these networks is considered a crime.
The authorities carry out regular crackdowns to seize satellite dishes, removing them from rooftops, and issue warnings against their use.
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Iran's new President Hassan Rowhani, considered a moderate, has been critical of such crackdowns, saying it was a "violation of personal privacy" and a failed attempt to prevent Iranians from connecting to the outside world.
IRIB is allocated huge budgets to compete with the influence of these channels.
Under the constitution, the Iranian government has a broadcasting monopoly, and all television and radio stations are state-run and operate inside the country.