Abstract: A dual mode broadband antenna especially designed to provide an omni-directional low angle or high angle radiation pattern which is predominately horizontally polarized is disclosed herein. This antenna utilizes four wire radiators in the form of an inverted conical log-spiral supported in a vertically extending fashion a predetermined distance above the horizontal ground plane. In order to alternatively operate the antenna in its high and low angle modes, first and second oppositely phased AC currents are applied to the radiators in two different ways using a simple switching device rather than a more complicated network of four hybrid circuits.

Abstract: A dual mode broadband antenna especially designed to provide an omni-directional low angle or high angle radiation pattern which is predominately horizontally polarized is disclosed herein. This antenna utilizes four wire radiators in the form of an inverted conical log-spiral supported in a vertically extending fashion a predetermined distance above the horizontal ground plane. In order to alternatively operate the antenna in its high and low angle modes, first and second oppositely phased AC currents are applied to the radiators in two different ways using a simple switching device rather than a more complicated network of four hybrid circuits.

Abstract: A collapsible apparatus for supporting an antenna or other such device at a predetermined orientation with the horizontal is disclosed herein along with a kit for and method of assembling the apparatus. This apparatus is made up of a number of straight structural members interconnected in a specific way to form a matrix which is movable between a first collapsed position and a second extended position. In this way, with the matrix in its collapsed position, an antenna can be assembled and mounted thereto and thereafter raised to a higher location by moving the matrix to its extended position. When the particular matrix disclosed herein is in its extended position it is combined with three additional structural members to form an octahedron pair for supporting the assembled and mounted antenna.