This is my antenna.
Is a 5 bands two elements cubical quad. I think this is the better antenna for HF.
This costruction is composed by a boom of 280 cm and spreads are in fiberglass, 380 cm for each one.
Radiators loops are one wavelenght less 2%. Reflectors loops are = radiator plus 5%.
Line feed is 50 ohms coaxial with 1/4 wavelenght stubs at 75 ohms.
If you need more details for costruction write me at this address [email protected]