You're both right and wrong about higher frequencies with shorter range. The number 1 reason in example for Wi-Fi router on 2.4 GHz. power output is around, 50mw. as of 5 MHz. output power is around ONE (1mw.) As longest as you're in the direct line of sight, on very low noise higher frequencies bands, your range it can goes for fairly long distance. The blockage will really screw up your distance on higher frequencies.
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