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 Here is an explanation of the 40 Mtr. Sloping cage antenna. This one is 30 foot six on each leg. There are eight wires in the cage . Made from #14 house wire with the covering removed. I used all the white on the up side from the center, and the black on the down side. The common was saved for future wire antennas. I have a 1/8th cable running through the center of the spacers. The spacers are made of mahogany doorskin. The spacers are spaced 32 inches apart 5 inches in diameter at the holes for the wires. There are eight wires to the element, not counting the cable in the center. Now the dimensions will vary how You apply the antenna. In di-pole configuration. And inverted . The lengths will be longer. One must remember that this type of antenna will be shorter than normal. Due to the large effective element size. I used cable clamps (as small as possible) to clamp the ends. I soldered the wires together at the center insulator feed points, with a clamp also. The insulators are the type that hydro uses for the guys on their poles. ( The old brown ceramic ones.) A rule of thumb for the spacers. Cut one out and paint it with INDOOR Urethane. Then put it in the microwave for 30 seconds at high power. IF IT DOSNT HEAT UP ITS OK TO USE. That means the material is not R F sensitive. This one gives Me about two to three S ; Units better on receive than the single wire. And the proof is in signal from here how it works on transmit. 
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