[TowerTalk] 80m DX special dipole

[Guido Tedeschi]

I built an 80m DX special dipole.

http://1vc.typepad.com/ethergeist/2011/01/a-broadband-contest-antenna-for-80m.html

I used the Messi & Paoloni BROAD-PRO 50/C cable instead of RG213 
(https://messi.it/dati/immagini/BROAD-PRO50-All6_EN.pdf).

The cable lenghts are recalculated for a velocity factor of 0.85 instead 
of 0.66 and the overall lenght (cables plus wires) is the same of the 
original project, but the result is not satisfactory.

The SWR pattern is correct but it is like having an offset of about 2: 
the two lower dips have an SWR of about 2 and the highest SWR on band 
reach 3

What could be wrong?

Is it necessary to use a cable with 0.66 velocity factor?

Thanks and 73

Guido, ik2bcp