Tzitzikes wrote:
"Whitch of the above antennas I have described is the best?"

At 1431 KHz, you need vertical polarization to avoid ionospheric
propagation.

You can turn your inverted L into a T by connecting its vertical part to
the exact center of the horizontal part. Horizontal currents in the
capacitive hat will then be equal and in opposite directions and not
rafiate. The capacitive hat should be just as effective in loading the
vertical section as the horizontal part of your inverted L is but unlike
the L, the T should not radiate any horizontally polarized energy. There
should be no change needed in your tuning coil and capacitor.

Best regards, Richard Harrison, KB5WZI