It is also known as Hertz antenna. A half-wave dipole antenna consists of two quarter-wavelength conductors placed end to end for a total length of approximately L l2The current distribution is that of a standing wave approximately sinusoidal along the length of the dipole with a node at each end and an antinode peak current at the center feedpoint. 143 frequency in MHz.
468 freq mHz Length feet.
F - the desired frequency. A dipole antenna is an antenna with two equal length elements on each side. Without the end effect the length of a dipole could be calculated from the formula length metres equals 150 f where f is the frequency in MHz. 143 frequency in MHz.