Coming off their divisional win over the Cowboys, the Eagles stayed at home for a Week 9 Monday night duel with the Chicago Bears.  Philadelphia trailed early in the first quarter as Bears quarterback Jay Cutler completed a 5-yard touchdown pass to tight end Matt Spaeth.  Chicago would add onto their lead in the second quarter as kicker Robbie Gould booted a 51-yard field goal.  The Eagles answered with a 47-yard field goal from rookie kicker Alex Henery. followed by rookie linebacker Brian Rolle returning a fumble 22 yards for a touchdown, but the Bears would close out the half with running back Marion Barber getting a 2-yard touchdown run. Philadelphia took the lead the third quarter with a 4-yard touchdown run from running back Ronnie Brown, followed by a 33-yard touchdown run from running back LeSean McCoy.  Chicago replied with Gould making a 38-yard field goal.  Afterwards, the Bears retook the lead with Cutler completing a 5-yard touchdown pass to wide receiver Earl Bennett, followed by Gould getting a 22-yard field goal.  The Eagles tried to rally, including an unsuccessful fake punt by Chas Henry, but Chicago's defense held on to preserve the win.

Based on the above article, answer a question. How many more yards was Robbie Gould's longest field goal over his shortest?
29