Cubex Quads
P. O. Box 352
 Alto, MI 49302

or by email


We sincerely believe that our 52+ years in the Quad Antenna Business (specializing exclusively in quad Antennas) has made it possible for us to offer you the very best in electrical and mechanical design and performance. CUBEX is currently the only manufacturer offering a choice of our premium MK SERIES, PRE-TUNED QUADS, the "do-it-yourself" SKYMASTER KIT series, and our new lower cost EXPO series of full size antennas.

THE COMPLETE PRE-TUNED QUAD- MARK SERIES
In this category we offer the well known MK-II, III, and IV Series of two, three, and four element arrays, featuring Single, Dual, Tri-Band and Five Band Models. These come to you knocked down, ready to assemble and operate in a matter of a few hours. Elements are cut to exact size, identified and clearly marked at attachment points. The detailed step-by-step assembly instructions offer a completely "Pre-Tuned" installation using the optional Cubex "MATCHING TRANSFORMER" or the preferred method of using separate feeds for a multi-band quad in which separate, odd quarter wave (1/4w;3/4w), 75 ohm coax, linear matching stubs (Remote Antenna Switch required). All of our VHF, 6M, 40m MANTIS and the new line of EXPO and MAGNUM-CB Quads are pre-tuned as well.

THE QUAD KIT- SKYMASTER SERIES
In this category we offer the CUBEX SKYMASTER QUAD KIT at a highly competitive price. These kits are offered in 2, 3, and 4 element models and employ 2-piece fiberglass spreader arms and the same cast spiders that has made the CUBEX MK Series the standard of comparison of the quad antenna industry. All kits include the complete and comprehensive CUBEX QUAD Construction manual. It contains all the detailed information and design data for constructing and installing 2, 3, and 4 element, single, dual, tri-bands and 5 band quad antennas of the type that have been making DX history for nearly 47 years.

QUAD COMPONENTS
CUBEX offers the "Do-it-Yourself" quad builder a complete line of individual quad parts which are available in any quantity. Aluminum 2 inch, 3 inch Booms, lengths up to 30 feet, Fiberglass for booms and spreaders, solid and stranded element wire, and a variety of other hardware.  We call particular attention to the cast aluminum QUAD SPIDER for HEAVY DUTY 3 inch O.D. booms (a must for quads of 3 or more elements).
See Hardware page for details and prices. Hardware & Parts

PERFORMANCE AND DURABILITY
The CUBEX electrical design has proven to be a superior performer as evidenced by a constant flow of unsolicited testimonials from hundreds of users in every part of the world. Finally, the prospective quad buyer is (and most certainly should be) concerned about just how well it's going to stay "up there" once valuable time and money was used to put it there. The CUBEX mechanical design is the result of years of experience plus never-ending efforts to update and improve our products.

A superior, one piece Cast Aluminum Spiders are used for our "Top of the Line" MARK and the kit SKYMASTER series designs.  They are heat-treated for maximum strength and durability.  Durable ONE PIECE tapered spreaders in the Mark series and Three piece, telescoping fiberglass SKYMASTER arms are standard.  Our booms heavy wall  2 or 3 inch aluminum tubing with the larger arrays using a bridge Truss to eliminate any possibility of "boom-droop". 

Our new line up of EXPO and MAGNUM-CB series antennas utilize the same robust fiberglass used in the SKYMASTER, and featuring aluminum booms (square and/or round), with stainless hardware for critical assemblies.  Easy to assemble, AND take down, making them ideal for Field Day or Expedition service. The EXPO series specializes in Mono-band arrays, but Dual and Tri-band arrays are available.

We appreciate your interest in CUBEX products and hope that we may soon have the pleasure of welcoming you into the ever-growing, world wide family of CUBEX QUAD owners.

Sincerely,

Roger Greenfield, WB8NDC


QUAD VS. YAGI

Dear fellow Amateur,

Why should you choose a Quad antenna over a Yagi? Well lets see! More gain, lighter weight, smaller turning radius, better front to back ratio, better side rejection, less QRN (static), better reception, lower radiation angle, and will work efficiently at a lower elevation than a Yagi. Wow that's a lot of reasons, lets look at them one at a time.

  1. More gain. Numerous tests over the years have shown the Quad to have 1 to 2 db more gain for antennas on the same length boom with the same amount of elements over the Yagi (2 el Quad = 3 el Yagi).
  2. Lighter weight. Due to the use of light weight fiberglass spreader arms Quads are typically lighter in weight than Yagi's of similar gain.
  3. Smaller turning radius. A two element quad with a gain of 8-10 dbi has a turning radius of only 10.1 ft. You won't find a Yagi with that much gain that will turn in that little space.
  4. Better front to back ratio. When a Quad antenna is properly tuned the lobes off the back of the Quad can be brought to a smaller magnitude then is normally found in a Yagi array.
  5. Better side rejection, less QRN, better reception. The design of the Quad is such that the top half of the vertical element is 180 degrees out of phase with the bottom half which causes any signal striking the vertical portion of the driven element to be canceled. This is also believed to be the reason that a Quad is so outstanding at being a low noise antenna for reception.
  6. Lower radiation angle; operates efficiently at a lower elevation. The Yagi half-wave elements are more affected by their proximity to the ground because of the presence of high voltage at the element tips - 'tip to ground capacity' One effect is to lower the arrays frequency as it approaches the ground. The Quad loop on the other hand is essentially a stacked two-element array of very low proximity effect, and this "stacking effect" results in an inherent gain and a lower angle of radiation. This is why the Quad will be efficient at an elevation as low as 35 ft. The low angle of radiation also means less skips to any distant station which results in a stronger signal on the other end where it counts.

So you might say, why isn't everybody using a Quad antenna? Well I don't know for sure but I think its because the early Quads were built with bamboo spreader arms, and make shift, wood arm-to-boom supports. Although quick and easy, these materials were rather fragile, and the antenna structure was prone to pre-mature failure. The quads that Cubex builds today use nothing but best fiberglass spreader arms available, cast aluminum hubs for strength and heavy duty aluminum booms on our HF quads.  Let me tell you these Quads are tough. When Hurricane Andrew came through Florida there were a lot of towers that came down with the Quads still intact (until they hit the ground!). We have unsolicited reports of Cubex Quads withstanding over 100 M.P.H. winds with no damage. Check out some of our customer comments as to the ruggedness and survivability of their Cubex Quads.

In closing I might add that the Cubex five band Quad is actually 5 separate, full wave loop element arrays, independent of each other on one support structure. I would say that's really a fantastic antenna and I haven't seen any Yagi's that compare.

Some of this information is from the Crown Manual written by Clarence C. Moore W9LZX the inventor of the Cubical Quad Antenna.


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