The 83-year-old Hall had initially denied the charges. The prison sentence was handed down today, six weeks after he admitted responsibility for the crimes.
The offences happened between 1967 and 1986. Prosecutors said Hall was an opportunistic predator.
BBC said after his admission of guilt that it was "appalled" and would no longer employ him.
Hall's lawyer has said he is sorry for what he has done and wants to apologise to his victims.