LVA antenna
The Large Vertical Aperture Antenna (LVA antenna) is a phased array antenna and consists of a horizontal array of vertical radiators, which in turn contain several individual radiators. These individual radiators are fed with different, but fixed, phase and power.
This creates a vertical directional pattern that can be shaped and, for example, is more sharply delimited towards the ground, has fewer side lobes there and radiates more in the main direction and upwards.
LVA antennas with an antenna pattern that is limited to the ground thereby reduce the reception of signals via a second path via reflections on the ground or on buildings. This keeps the probability of the occurrence of incorrect answers or incorrect location and thus the error rate when used in secondary radar devices very low.