Not sure how their antennas are constructed - if they are fabbed on a PCB, often at microwave frequencies you need exotic substrate material (e.g., Rogers) to c

Not sure how their antennas are constructed - if they are fabbed on a PCB, often at microwave frequencies you need exotic substrate material (e.g., Rogers) to cut down on losses. Those substrates are expensive compared to FR4 (fiberglass common in PCBs).