Based on this product's specifications, here are some alternatives and similar models
Omni-directional antenna DeLOCK 88877
Summary description:
The DeLOCK 88877 is an omni-directional antenna with a gain of 3 dBi and a 50 Ω impedance. It features a vertical polarization and SMA connector type, making it suitable for various applications. With compact dimensions of 30 mm width, 30 mm depth, and 150 mm height, it is easy to install and integrate into your network setup. Ideal for enhancing signal reception in multiple directions.