Based on this product's specifications, here are some alternatives and similar models
Directional antenna Lancom Systems AirLancer ON-D8a — 21 dBi, 4.9–5.9 GHz, N-type, dual linear polarization
Summary description:
AirLancer ON-D8a is a directional antenna by Lancom Systems operating across 4.9–5.9 GHz with maximum gain of 21 dBi and 50 Ω impedance. It features an N-type connector and dual linear polarization for targeted wireless links. Compact metal housing (370×370×30 mm) suits point-to-point or sector installations where focused high-gain coverage and stable polarization are required.