Based on this product's specifications, here are some alternatives and similar models
Omni-directional antenna DeLOCK 88899
Summary description:
The DeLOCK 88899 is an omni-directional antenna with a gain of 7 dBi, suitable for 2.4 - 2.4835 GHz and 5.15 - 5.875 GHz frequency bands. It supports various networking standards including IEEE 802.11a/b/g/n/ac/h. The antenna features an RP-SMA connector and is designed in black. With compact dimensions of 18.4 mm width, 18.4 mm depth, and 231 mm height, it is ideal for enhancing wireless connectivity in various environments.