How to deter wild pigs and boars:
The Yard Gard and Solar Yard Gard are electronic ultrasonic repellents that use sounds out of the range of human hearing to irritate pest animals, repelling them from your property. These products have proven successful against wild boars, including large species in Hawaii. The animals are not harmed by the ultrasonic frequencies emitted, but are rather encouraged to find more peaceful, untreated areas. Each unit protects 3,000-4,000 square feet in an open area.
For larger areas without close-range neighbors, such as corn fields and large open spaces, the Critter Blaster PRO covers up to 6 acres. Another silent-to-most-humans ultrasonic technology is the Ultrason X, which covers up to 3,600 square feet. Both units come with 4 speakers which can be placed in separate areas to account for any walls or large foliage which may otherwise block sound waves.
It is important to note that while Bird-X products help to repel such hogs, caution should be taken in areas they are known to live. Wild hogs are extremely difficult to repel with 100% accuracy, even when fences and other measures are taken.