Antenna as 3Band Version
All my previous versions were monoband versions,
that means, one has to change the radiator to
change the band.
Now, I could make a 3 band version for the bands
14, 18, and 21 Mhz.
The length of the radiator is 145 cm with a
thickness of 5 cm (2 inch).
The HF properties are equally good as for the
The fieldstrength was measured at a distance
of 40 m at an elevation angle of 10 degr. and
the difference between the two antennas was
below 0.1 dB. (Comparing monoband 20 m
against 3 band version on 20 m).
Bandchange is done manually in seconds
without exchanging any part of the antenna.
The SWR is again 1.0 in the center of each
The MFJ-269 reads: R=50, X=0, SWR=1.0
measured after 2.5 m coax cable, antenna installed
on Honda Accord.
The SWR remains below 1.5 at the band ends.
The first QSOs today were on 17 m with Canada,
report received S7, and on 20 m with Finland,
received S9+10 dB.
In the next step I will try to make bandchange
with remote control.