The MULDIPOL Multiple Dipole Collinear Array concept has been specifically developed for ground-air-ground, air traffic control and associated vehicular and base communications applications.  This omni directional concept employs a unique method of shielding the feed cables to improve radiation pattern characteristics. The MULDIPOL also has a high degree of isolation between discrete elements within a closely spaced array. The result is a small, rugged, easy to install antenna.  The lightweight and compact design minimizes space and lends itself to tactical transportable use in the most hostile environments.  A minimum of 30 dB isolation is realized between any two antenna elements in every MULDIPOL model. The low profile of this antenna plus the resulting decrease in the number of antennas required at any tower site also gives a much improved radiation pattern coverage.  The process employed in this series of antennas incorporates the patented MULDIPOL concept. The utilization of this technique results in a unit which has excellent broadband halfwave dipole characteristics over the entire operating frequencies. The desired figure eight radiation pattern is generally constant throughout the band. Through broadband suppression of extraneous currents upon the transmission line, the undesirable Clover Leaf pattern is avoided.
The 4000 series has a fibreglass (non metallic base) and therefore has no DC ground path for the dipoles.  If DC ground is a requirement then please refer to 5000 series.

Some models are available with a split or folding option to halve the stowed length for ease of transportation.