I am using a Johnson KW Matchbox antenna tuner with a 130 foot long, 30
foot high dipole fed with about 40 feet of ladder (window) line. It
works well on all bands including the WARC bands *except* for 30 meters.
(it doesn't make any difference if the band switch is on 20 or 40--it
will not tune 30 in either case).

The question is, does anyone have any tips/suggestions/modifications to
make this also operate on 30 meters?

By the way, modifying the antenna is not an option--lucky to have it up
at all with city and subdivision restrictions. Maybe could add extra
ladder line in the basement shack, but would have to loop it around the
basement ceiling???

73,
Carter
K8VT