Hello Jobst
I use a 40 meter center fed dipole (120 foot long) with a 4:1 Guanella balun 
( QST april 2010) which gets direct onto the K3 automatic antenna tuner .

I can operate from 160 to 10 meters, as, once ajusted, it memorizes all the 
frequencies. Of course I use the second antenna output A2 which is 
automatically connected when I switch to 40, 80, or 160, the other bands 
having separate antennas, (though I can use these  on the dipole as well in 
case of need).

The dipole, due to its particular length and balun arrangement, I suppose, 
has two resonances without the tuner on 30 m and...2 meters !
I think the K3 is a good choice as a new rig !

73
Jacques de F9OJ 

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