Topband: 160m/80m duoband vertical question

[john]

how much spacing needed between the 160 and vertical elements
thanks  john w8wej
On 11/5/2013 15:28, Victor A. Kean, Jr. wrote:
> On Tuesday, November 05, 2013 7:27:50 AM Jim Garland wrote:
>> Is it workable to put an 80m 1/4 wave wire on
>> the same mast join both antennas at the base, in the same way people make
>> multiband fan dipoles?
> Jim:
>
> My 160 vertical is a 65 foot Tee (top wires are 70 plus some feet).  I added
> 80 meters with a parallel wire which has to fold back at the top making
> an inverted L.  It works, but the bandwidth is very narrow, maybe 50 kHz.  I have
> a total of 4 80 meter wires making a "cage" around the 160 meter vertical, each
> wire tuned for a different segment of the band.  Conveniently, the lowest
> frequency wire at 80 meters has the same impedance as the 160 meter vertical
> so no extra match effort is required.  The other wires don't quite get to the
> right impedance, so an antenna tuner is required.
>
> I would much rather have a separate, full sized 80 meter vertical.
>
> Victor, K1LT
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