Based on this product's specifications, here are some alternatives and similar models
LANCOM AirLancer O-360Q-5G Omni-directional Antenna, 1.7 dBi, 5 GHz, SMA Connector
Summary description:
The LANCOM AirLancer O-360Q-5G is a high-performance omni-directional antenna designed for 5 GHz frequency bands. Featuring a 1.7 dBi gain and a standard SMA connector, this white antenna provides reliable signal coverage for professional wireless networking environments. It is engineered for durability and efficient signal distribution in various indoor or outdoor setups.