Multicast and broadcast are different. Broadcast frames are directed to ALL stations by filling the group address field with all ones (FF:FF:FF:FF:FF:FF), whereas multicast frames are directed to an address assigned to a given multicast group. Broadcast frames are thus intended to affect every station associated the AP, while multicast frames are intended to affect only those stations participating in a given multicast group.
However, keep in mind that 802.11 channels are shared media. All transmissions -- whether broadcast, multicast, or unicast -- consume bandwidth and therefore reduce the resources available to other stations competing for that same channel.
Dig Deeper on Wireless LAN (WLAN)
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