A directional antenna apparatus capable of radiating radio signals in various directions may include first, second, third and fourth main director elements forming a square; first, second, third and fourth sub-director elements extending from the center portion of the square to the first, second, third and fourth main director elements, respectively, inside the square; first, second, third and fourth radiators disposed in parallel with the first, second, third and fourth main director elements, respectively, outside the square; and a selection switch configured to selectively connect any one of the first, second, third and fourth radiators to an external device.