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A centre-fed half-wave dipole has two equal arms.

A centre-fed half-wave dipole has two approximately equal arms.

From purpose through dipole and groundplane to a reasoned design. With drawings, prepared calculations and six knowledge checks.

dBd references an ideal half-wave dipole.

Plan a centre-fed dipole as a learning example for 145 MHz with k = 0.95.

At the same frequency and factor, calculated radiator length is approximately one dipole arm.

A horizontal dipole and a vertical radiator are therefore not simply interchangeable.

A geometric half-wave dipole is about half a wavelength long.