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two frequencies are the range (coverage) and bandwidth (speed) that the bands provide. The 2.4 GHz band provides coverage at a longer range(20–30Ft) but transmits data at slower speeds. The 5 GHz band provides less coverage but transmits data at faster speeds.
The range is lower in the 5 GHz band(10–15 ft)because higher frequencies cannot penetrate solid objects, such as walls and floors. However, higher frequencies allow data to be transmitted faster than lower frequencies, so the 5 GHz band allows you to upload and download files faster.