"I have a k3 with internal antenna tuner connected to a 40 meter dipole
in the attic. Will the internal ATU work for me visiting other bands
or would I be better off installing a tuner between the rig and the
antenna? Is an auto tuner more preferred than automatic?"
An auto-tuner IS automatic! The K3 internal auto-tuner tunes a wide range
and it works great. But if you are using a coax feed with the 40-meter
dipole the SWR will be so high on bands other than 40 and 15 meters that
you'll probably suffer pretty bad coax cable feedline losses. You might try
a fan-dipole arrangement in the attic. As an example, parallel the 40-meter
wires with 20-meter wires fed at the same point.
Phil - AD5X
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