What is a dual band wifi amplifier Dual band WiFi amplifiers are the ones that are able to use both 2.4Ghz and 5 Ghz bands. You can use one band at a time, or you can use both at the same time. The difference between 2.4Ghz and 5Ghz band is the speed. 2.4Ghz offers a better range, but a lower speed. 5Ghz offers a higher speed, but less range. When deciding on a dual-band WiFi amplifier, make sure that your devices are compatible with the latest 5GHz band. Some of the old devices...