Worn Out Retread wrote:
Does anyone have experience in using ultrasonic bird repellers? Do
they work or are they just a fancy gadget that actually does very
little or nothing?
I need something that won't disturb my neighbours' and rid my large
tree of birds. They are making a terrible mess under the tree.

Don't know about ultrasonic, but supersonic things (like a .22 bullet) will
work.