What is the difference between 802.11a and 802.11h ?
802.11a works in the 5150 - 5350 MHz and 5725 - 5850 MHz bands in the 5 GHz range.
For 802.11h, it must be in the 5470 - 5725 MHz with dynamic frequency selection.
Obviously, due to the complicated hardware and software designs, the costs of 802.11h products will be higher than 802.11a. For me, as 802.11a, 802.11g and 802.11h all operate with 54 Mbps, there is virtually no difference to me. If I have to choose, I will not pick 802.11g which operates in the highest noise 2.4 GHz band. 802.11a in the lower 5 GHz band looks good to me as this band is quite clean.
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