Gary - depends on your antenna and how you feed it.
If you intend to feed a multi-band antenna with open wire line, you'll need
some sort of tuner at the point where you transition from open wire to coax:
- if you plan on doing that out near the base of your antenna (the most
efficient spot) then save your
money and purchase an auto tuner, e.g., an LDG Z11 ProII, and place it
at the point where the open
wire line transitions to coaxial feed.
- if you plan on doing that inside the shack and can keep the coaxial run
short, the internal auto tuner
would work, albeit you could employ an LDG Z11 ProII there as well.
If you plan on feeding any multi band antenna with coax of a length longer
than 10' to 15' an auto tuner inside the shack isn't worth much -- place an
LDG Z11 ProII style auto tuner at the base of the antenna, 'tween the
coaxial fee line and the antenna feed point and call it a day.
If you plan on taking the K3S on portable trips....its auto tuner wud be 'da
way to go, as long as you keep coaxial runs 'tween the K3S and the antenna
feed point short...."short" means < 10' to 15' or so.
72 de Jim R. K9JWV
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