Multiple monopole aerial

A radio frequency aerial consisting of two or more electrically conducting monopole elements (e.g., E1, E2, Fig. 2) positioned so that they can interact with a ground plane (G, Fig. 2) to produce a near-spherical far-field pattern at right angles to the ground plane at the lowest resonant frequency. The elements are approximately one-quarter wavelength long at the lowest resonant frequency and consist of one or more components made from rods or wires. The elements are inwardly inclined, crossing over but not touching. The aerial feeder may be conventional conducting cable F and the feeder connection may include a matching unit M.