Abstract: A multiple-frequency monopole or dipole antenna or antenna element that exhibits resonance at multiple arbitrary predetermined frequencies at a single feedpoint includes a driven conductor operative on a first arbitrary predetermined frequency and including a feedpoint. A number n of additional non-driven conductors, wherein n is at least one, resonant at respective n arbitrary predetermined frequencies different from the first frequency are disposed in substantially parallel spaced relationship at a predetermined spacing to electromagnetically couple the driven and non-driven conductors and produce a non-reactive impedance at the feedpoint at the first and at each n additional frequency. Preferably, the predetermined spacing of the driven and non-driven conductors is determined according to the equation: ##EQU1## where d.sub.