Consider how your neighbours will react to loud noises. Plan to move devices to a different location often so that geese don't get used to them. It's best to use visual repellents such as scarecrows and flags in combination with audio repellents such as automatic exploders and sirens. The most commonly used visual repellents are scarecrows and large helium-filled balloons. Some people also use strobe lights, reflecting tape and Mylar flags.
Repellents work best when they move in the wind.
Mark large eyes on balloons. Scarecrows can be made out of almost any material including straw and wide plastic streamers. Use bright colours such as red, orange and yellow. Mark large eyes on the scarecrow. Allow arms and legs to flap in the wind.