Based on this product's specifications, here are some alternatives and similar models
Omni-directional antenna DeLOCK 12715
Summary description:
The DeLOCK 12715 is an omni-directional antenna with a gain of 1.6 dBi, operating at a frequency of 0.868 GHz. It features a 50 Ω impedance and an SMA female connector. Compact in size with dimensions of 8 mm width, 8 mm depth, and 51.5 mm height, this antenna is ideal for various applications requiring reliable signal reception.