As the American Football conference champions go head-to-head at the weekend, the battle of the brands will see companies investing millions in advertising.

The Super Bowl, the final game in the National Football League season, is by far the most-watched broadcast in the US each year.

Last year's Super Bowl drew the largest television viewing audience of all time with 106.5 million viewers. And according to market analyst Nielsen, last year 51 per cent of those polled were more interested in the commercials than the Super Bowl.

This year, businesses, such as Hyundai, Coca-Cola, General Motors, Anheuser-Busch and PepsiCo will pay an estimated $2.8 million to $3 million for a 30-second ad during the game.

PepsiCo will run six consumer-created ads for its Doritos and Pepsi MAX brands. The ads are from the winners of a contest.

Coca-Cola, internet domain name provider Go Daddy, and the small online vacation rental marketplace HomeAway will all also advertise during the big game. All with hopes their ads will generate consumer buzz after the game.

The Green Bay Packers will play the Pittsburgh Steelers for the Super Bowl XLV title on Sunday, February 6.