Budapest anti-fading aerial

This consists of a single steel mast of special form, acting as the radiator: the working wave-length is 549.5 m., and the height of the structure is 307 m., which gives a natural wave-length of 1266 m. The mast is completely insulated and the guy cables are attached near the middle, which corresponds very nearly to the voltage node, so that the voltage applied to the guys is small. The tower is square in section and copper cables are carried from top to bottom at each corner on the outside to ensure good h.f. conductivity. The height of the mast can be varied by 12% by raising or lowering a galvanised steel pole projecting from the top, to provide for any error in forecasting the natural wave-length. The principle of the system is discussed.