At the top of the Cubex Quads product line, the Mk-Series are complete and pre-tuned HF antenna systems. These distinctive antennas are the result of 65 years of quad design and manufacturing experience. For decades, Cubex Quads has been providing BIG SIGNALS for operators in many countries throughout the world. Cubex Quads products continue to be the standard for performance and mechanical durability by which all others are compared, and we continue searching for ways to improve on our superior designs. Go with “the choice of DX Kings”… go with Cubex Quads!