Wind Chimes can keep birds away from areas since birds can get startled by any unexpected sudden noise and will fly away when they hear it.
So long as the wind is blowing or the bird happens to land on the wind chimes they'll likely fly away from the area when they get startled.
Even mounting a fake plastic Hawk on your porch or any other area you want to keep the birds away will work or you can also use reflective bird diverters to keep birds away.