There is a low impedance feedpoint for a full wavelength 11 meter antenna.
Simply feed it 1/4 wavelength from the end and add an RF choke to the feedline.

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3 X 2.58 meters || 2.58 meter
feed point

Cecil can tell you the feed system details.

/s/ DD, W1MCE

Richard Fry wrote:

"Richard Clark"

A full wave antenna has no advantage over a half wave.
It's mismatch is very bad. No BalUn is going to fix that.

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The peak, free-space gain of a full-wave linear dipole is about 1.65 dB
greater than that of a 1/2-wave dipole. Its center fed impedance is
high, but can be transformed at its feedpoint to match conventional
transmission lines.

Many AM broadcast stations use a 1/2-wave vertical monopole, which when
working against a very good radial ground system constitutes a full-wave
antenna. They do it to improve their groundwave field compared to a 1/4
wave monopole, and to reduce nighttime interference to their groundwave
by their own skywave.

But maybe the typical amateur operator would not consider these benefits
worth the effort.

RF