We started with some experiments to develop a 80 and 40 meter dual band wire antenna for 200 watt. With a matching network housed

in the same housing as the 40,20 and 10 watt HyEndFed MultiBand

The first tests where great. The overall lenght will be between 22 and 25 meters long with a coil on 20 meter.

So the antenna acts has a full half wave on 40 with great efficiency and a shortend half wave on 80 meter.

No tuner needed for the 40 meter band. On 80 you need a tuner on the bandedges.

After some alignment of the wire length  and carefully experimenting with the  isolation coil in the wire we managed to make a 5
band antenna. Good for 80, 40 ,20 ,15  and 10 meter. On 15 meter some tuning is necessary.

On the left the coil for the 80 &40 meter multiband on the right the coil as used in our 40,20 and 10 meter HyEndFed multiband