We claim: 1. A collinear aerial, characterized by one or more dipoles, being excited off the tappings 6f a coaxial transmission line, the one arm of which dipole is represented by a conducting element on the transmission line, having the approximate length of half a wave, which conducting element is placed around the coaxial transmission line and is galvanically connected, at its centre, with the outer conducting element of the coaxial transmission line, with the other arm of the dipole being represented by that section of the outer conducting element of the coaxial transmission line, which is bordered by two first-mentioned dipole arms, which have been determined above, or which is bordered by the one said dipole art, determined above, and a skirt, having the length of (2n+I) multiplied with one fourth of the wavelength where n=0, 1, 2, 3, . . . n.
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