![]() While the main point of Moore's patent was the two turn single loop design which is not the antenna termed "quad" today, the patent does include a mention and illustration of a two element unidirectional "quad", and describes the time when the full wave loop concept was developed: Moore describes his antenna as "a pulled-open folded dipole". He developed this antenna to resolve issues caused by large coronal discharges while using a beam antenna in the thin air of higher altitudes. Moore, W9LZX, a Christian Missionary and engineer at HCJB (a shortwave missionary radio station high in the Andean Mountains) developed and patented a two-turn loop antenna that he called a "quad". patented a loop antenna with rhombic shape and quarterwave sides. In 1924, Moses Jacobson patented a loop antennas with rhombic shape.The quad antenna is a development of several inventions. 3 Disadvantages compared to other antennas. ![]()
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