Abstract: The present invention concerns a high frequency radiating line for radiating electromagnetic energy in a frequency band and comprising at least one tubular conductor (23) surrounding a longitudinal axis (X) and having a plurality of apertures formed into a series of identical patterns (M1) repeated periodically with a period P along said line, characterized in that, when the operating frequency band is of the type [f.sub.r,(N+1)f.sub.r ], where f.sub.r is a given frequency and N is a positive integer greater than 1, each of said patterns (M1) comprises N apertures 0 to N-1 and satisfying the following equations: ##EQU1## where: the index k is an integer such that 1.ltoreq.k.ltoreq.N-1 and refers to the k'th aperture of one of said patterns (M1),z.sub.k is the distance between said k'th aperture and first aperture (F0) of the pattern,a.sub.k is the polariability of the k'th aperture,a.sub.o is the polarizability of the first aperture, ##EQU2## where E(x) designates the integer part of x, p.sub.