Catholic University's vastly improved soccer team used an opportunistic offense and the usual solid goalkeeping of freshman Bill Feehan to edge Georgetown, 1-0, yesterday on the Hoyas' field.

The victory was the fourth straight for Catholic after two opening losses to William and Mary and to Howard, both ranked in the national top 20. The Cardinals already have doubled their 1979 victory total under their first-year coach, Tripp Kline.

Terry Harrington's header at 64:37, assisted nicely by captain Jeff Klein on a corner kick from the right side, was the only score. Georgetown had a few excellent chances to score, but for the most part generated little offense. fThe Hoyas lost their fourth straight game, all by one goal.

"We were using a set play on the corner kick," said Klein, a senior winger from McLean High School. "I called out one play, but I have the option to pass it to another place if someone else is open. Terry was either unmarked or else he beat his man, so I passed it to him."

Klein's excellent placement, a low liine drive, found Harrington alone near the right post and the junior from Archbishop Carroll headed the ball in the right top corner.

Catholic outshot the Hoyas, 17-10, with sophomores Jean-George Balla and Mejri Abdellaziz often outmaneuvering the Georgetown fullbacks for good shots. Abdellaziz, a sophomore forward from Tunisia, continually dazzled with deft passes and moves to the goal.

Georgetown had a golden chance to score late in the first half. A long pass near the CU goal caught the Cardinal full backs napping, and junior Chuck Pepe fielded the ball with only Feehan between him and the goal. When Feehan came out to challenge Pepe, the midfielder cut to his right and blasted a hard dribbler that went just past the left post.

"I haven't really done anything different this year," said Kline, who at this time last year was playing on the Catholic team. "We have the same players. The difference is heart. We beat Loyola and George Washington, two teams that always beat us, simply because the kids believe in themselves. They don't let down."