dipolo

Hola Pedro.

Yo he encontrado esto:

The secret of the efficiency of this antenna is in the use of linear loading. This does away with the need for tuned traps and provides excellent performance. On 20m the bandwidth is very wide, mainly due to over coupling between the 20m element and the 40m element. On this band the antenna functions as a conventional dipole. On 40m, the antenna functions as a linear loaded dipole with an efficiency that is very close to a full-sized dipole and with a bandwidth that covers the full band. On 80m, the addition of choke inductors serve the joint role of isolating the 80m sections from the 40m section and loading the entire system to resonance on the 80m band. Typical useable bandwidth is around 70kHz but this can be extended with the use of an ATU. The antenna is rated at 400W. The system is supplied as a complete unit, but requires the purchaser to do the final assembly of the linear loaded element. The only tools required are a screwdriver and a pair of pliers with side cutters.

Espero te sirva..

parece ser una solucion,para poco espacio,por eso queria saber un poco el rendimiento,sobre todo en 40-80