I've used a C4S (short boom version of the C4) for almost 3 years and have
been quite pleased with it:
1.) I find it works as well on 17 meters as it does on 10-15-20. Note
however that the directivity is REVERSED on 17. The tuner in my
TS-870 handles the ~3:1 SWR quite well.
2.) I find performance on 12 meters to be decidely lacking, in fact
loading up the 40 meter dipole portion of the antenna on 12 is
much better than using the beam. This may be different on the
full size C3/C4.
3.) The 40 meter dipole does not work on 30 meters, beleive me I've
tried. For that band I had Tom build me a version of the Force 12
'ZR' vertical dipole...it works quite well.
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