It will be the jump of Robbie Maddison's life. The Aussie freestyle motocross star will attempt to jump the length of a football field in the middle of Las Vegas tomorrow and shatter the current Guinness World Record. The 26-year-old from Kiama, on NSW's south coast, hopes to jump nearly 110 metres in the air and fulfil his lifelong dream. "It's been a goal of mine to set the official longest distance jump and the other is to jump the length of a football field," Maddison told ninemsn from Las Vegas. "I'm pretty confident I've got this one and that...