An attempted carjacking has been broadcast live on ABC radio after a woman phoning in for a discussion on collections was held up in Brisbane's south.

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The woman had phoned in to David Curnow's Evenings program on 612 ABC Brisbane about 9:40pm on Monday to discuss her hair pin collection when she was abruptly cut off by yelling and swearing between two males in the background.

The woman, who was in the car with her husband waiting for their son to finish a training session at the Salisbury SES depot, was interrupted on air by a man trying to get into their car.

He was eventually scared off.

"We were worried for her but also not sure what had happened. We chased her up. I didn't really know what was going on," Curnow said.

"It just came out of nowhere ... it just suddenly cut in, she stopped talking ... I thought I was getting a crossed line.

"I put it on hold and told the producer to check to see if she was OK.

"She said she was shaken up and that she's called police."