What is a delta loop antenna with parasitic elements?

A delta loop antenna is essentially a variation of the quad antenna. Instead of using four-sided square loops, the delta loop uses three-sided wire elements arranged in the shape of a triangle, resembling the Greek letter 'Delta'. Like the quad antenna, the fundamental design requires the total perimeter of each triangular loop to measure approximately one full wavelength. By adding multiple elements (one driven element plus parasitic reflectors or directors), it becomes a highly effective directional beam antenna. Distractors suggesting a triangular arrangement of separate vertical antennas or multi-turn coils on a form are incorrect. The defining characteristic is the continuous, single-turn triangular loop of wire making up each element.