There are "shortened" 80M dipoles, having inductors in the legs to reduce
the length at resonance. A friend of mine has a commercial antenna of
this sort - I don't know the name offhand - which is fed with about 100
feet of ladder line and with a tuner will operate on all the amateur
bands 80M and down. It's not as good as a full length dipole, but he
is making contacts and having fun. You do what you can.
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jhhaynes at earthlink dot net