Based on this product's specifications, here are some alternatives and similar models
Flat-Patch Antenna ALLNET ANT-58-3T3R-PATCH-385
Summary description:
The ALLNET Flat-Patch Antenna 385 offers a maximum gain of 15 dBi, operating within the frequency range of 5.15 - 5.85 GHz. With a 50 Ω impedance and dual polarization, it ensures excellent signal quality. The antenna features an N-type connector and a low VSWR of 2:1, making it efficient for various applications. Its compact dimensions (385 mm x 80 mm x 385 mm) and maximum power consumption of 10 W make it suitable for both indoor and outdoor use.