I tested the antennas using a GL.iNet GL-AR300M16-Ext travel router powered by a portable phone charger. Using Wifi Analyzer, the closest router was 50 feet away at -63 dBm and the farthest one was 2500 feet away at -101 dBm. I assume the GPS was far away last time. In any case, it's good that the antennas are working.
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