Electronic Bird Repellant ?

[Andre Kesteloot]

Tacoistas,

Our two cars are parked in the driveway. From nearby trees, birds of all 
types appear to be taking our cars as dropping targets.
These droppings can really damage the car paint.
The Toyota dealer claims that there is an electronic unit, powered on 
110v AC, that can be left outside, emitting noises that scare away those 
$%&#@  birds.
As anyone ever heard of such devices?
If not, should the design of such a box become an AMRAD project ?
(Some people install owls replicas on their roofs. Would owls make a 
particular noise, that could be duplicated?)

73
André N4ICK