Mr Hall was 47 when he allegedly invited one of the girls, then a teenager, to the BBC in Manchester for a tour before inviting her to his dressing-room, where he plied her with Bacardi before carrying out the assault, Preston Crown Court was told yesterday.
The woman, who is now 52, said she would often go to the BBC studios to see Hall after that incident.
The court heard they would regularly go to the bar for a drink before going back to his dressing-room for more alcohol, when she would be sexually abused again.
Such incidents went into "double figures", she said, until she told him she had had enough. Hall, serving a jail sentence for sex offences, denies 20 charges of rape and indecent assault involving two victims in the 1970s.
The trial continues.