The relationship between the lengths is a function known as tau. The elements taper into a triangle shape. The different length of the dipole elements means that LPDA antennas transmit and receive signals on a wide range of cellular frequencies. The elements are spaced at intervals following a logarithmic function of the frequency, known as Σ or sigma. LPDA antennas have a wide range of dipole elements. Most directional antennas on this site are log-periodic dipole array antennas. This means that it will only transmit and receive signals on a very narrow frequency range. Since modern cell networks use a very wide range of frequencies, this means that yagi antennas are usually only suitable for certain public safety situations, or when only one specific network needs to be boosted. The frequencies the antenna picks up depends on the length of the dipole elements.Ī "yagi" antenna has dipole elements all of the same size. They are formed of a long central "boom" with attached metal rods called "dipole elements". They are very powerful at picking up signal in one narrow direction. Some manufacturers call these antennas "yagi" antennas, although technically yagi and LPDA antennas are slightly different.ĭirectional antennas need to be focused at the nearest cell tower.
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