Fiberglass Cubical Quad Spreaders


(Sold Individually) Buy one to replace a spreader, buy 4 to build an element

How to select the right spreader:

Band: lowest frequency (band) of your quad design.

Duty Type: (consider the HD version) Heavy duty increases weight, but also increases the survivability of the antenna

Base Reinforcement: (if applicable) Choosing the base reinforcement increases the strength of the spreader at the point of highest stress, at the hub.

Our wide line of fiberglass quad spreader arms allows our customers to select the ideal spreader arm for its intended role: lowest band desired, total number of bands, and the most severe weather conditions likely to be encountered in the customer’s location. You may design your quad with budget in mind, or to be “bulletproof”. In either case, our aim is to give you absolutely the most for your money.

MAX-GAIN SYSTEMS’ spreaders – unlike earlier types of sleeved spreaders using smaller diameter, less reliable materials-offer a number of advantages:

  1. FedEx shippable. Available since the spreaders telescope at 93 inches… saving a great deal over the motor freight charges required for all one piece spreaders.
  2. Strength. Our design puts the larger diameter (and therefore the greatest strength) where you need it most: at the point of attachment to the boom. The ends of the spreaders are light-allowing flexibility, yet more than strong enough for severe conditions.
  3. Length. Since each spreader is made from 93 inch sections, there is still up to 26 feet of usable length-even allowing an entire foot of overlap!!! More than enough for a 40M reflector arm.
  4. Stress point reinforcement. Some of the extra length can be used to reinforce the larger diameter with the smaller, at the point of highest stress: where the clamps secure the arms to the spreader mounting plate. This yields a full 1/4 inch wall thickness for most spreader types!!!

Buying spreaders to repair a damaged Lightning Bolt quad?? Take a look at this VERY well done page by WB9DLC:

WB9DLC Lightning Bolt Quad

PLEASE NOTE: If you have not done so already, be certain to visit this additional page on our site, which contains even more useful information of interest to quad builders:

Cubical Quad Builder’s Tips

Wire Attachment Method for Quads – Does Not Require Drilling Spreaders

The following photos illustrate an easy method of making almost indestructible clamps to be used to attach element wires on quad antenna spreaders. This method does not require drilling through the spreaders. Allowing easy and infinite adjustment of the corners of the wire loops, for easy and precise loop centering on the element spreaders. This method cushions and protects the wire elements at the points of greatest stress . the loop corners, and prevents sharp bends which weaken the wire.

These clamps consist of an ALL STAINLESS hose screw-clamp.. (be certain the screw clamp says “All Stainless” or the screw itself will be plated, not stainless, and it will eventually rust), a short length of copper plumbing pipe, and a plastic tube. Very simple, but effective. For the plastic tube, it is best to use a very tough and UV resistant material such as truck air-brake hose (from auto parts store) instead of clear vinyl tube. It will last MUCH longer. Also, spray-paint the plastic tube with flat-black spray paint for additional UV protection.


Minimum spreader lengths required for quad reflector loop at various frequencies*

  • 6 meters = 3.7 ft.
  • 10 Meters = 6.6 ft.
  • 11 meters = 6.9 ft.
  • 12 Meters = 7.4 ft.
  • 15 Meters = 8.8 ft.
  • 17 Meters = 10.2 ft
  • 20 Meters = 13.1 ft.
  • 30 Meters = 17.9 ft.
  • 40 Meters = 25.9 ft.

*(calculated for bottom end of bands)

Useful formula

In order to estimate how far out (measured from the center of the boom) a quad wire of a given length will intersect with a spreader, use this formula:

Take the total wire length of the quad loop in feet (for example, 70.79 ft for a driven element on the 20 meter band) and divide it by 4….(about 17.7 in our example). Then square the result…(about 313.3 in our example). Divide this figure by 2….(about 156.65 for the example) and then take the square root. For our example, this yields the result 12.51, so you know that the wire intersect point will be 12.51 feet out the spreader, measured from the center of the boom.

A far less complex method (with thanks to Ed Niemi, K6EDJ) is to simply take the cosine of one side of the quad loop, (.707 times the length of one side of the quad loop) and measure out the spreader (measure from the center of the boom) to determine the point of wire attachment! The measurement from corner to corner, measuring down one spreader, through the boom, and up the opposite spreader, (wire attachment point to wire attachment point) of each quad loop will be 1.414 times the length of one side of the quad loop.


Cubical Quad Builder’s Tips

Be sure to Check out our information and products to make your own HexBeam Antenna!

Additional information

Shipping Weight N/A
Shipping Dimensions N/A

10 meters, 11 meters, 15 meters, 20 meters, 30 meters, 40 meters

Duty Type

Light Duty, Standard Duty, Heavy Duty

Base Reinforcement?

No, Yes


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