What are the advantages of using the 5GHz band vs. 2.4GHz?
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All 5GHz channels do not overlap, which means that all channels can be used. The 2.4GHz band has effectively only three non-overlapping channels (1, 6, 11).
The 2.4GHz band is extremely crowded, both due to the overlapping channel issue and its use by cordless phones, baby monitors, etc. Overcrowding makes 802.11b/g WLANs unusable in some locations.