A method of wireless communication comprising: switching between a plurality of antenna array configurations during reception of a first wireless local area network, WLAN, packet (300, 400, 705), wherein the first WLAN packet (300, 400, 705) comprises a preamble (310, 410, 725), an extension portion (320, 420, 730) and a data portion (315, 415), wherein the extension portion (320, 420, 730) is appended to the first WLAN packet (300, 400, 705) after the data portion (315, 415), wherein the length of the extension portion (320, 420, 730) is signaled by the preamble (310, 410, 725); determining channel characteristic information associated with the plurality of antenna array configurations based at least in part on the reception of the first WLAN packet (300, 400, 705); transmitting a second WLAN packet using an antenna array configuration selected from the plurality of antenna array configurations based at least in part on the determined channel characteristic information; and determining a portion of the first WLAN packet (300, 400, 705) to switch antenna array configurations based at least in part on a number of antenna array configurations of the plurality of antenna array configurations and a length of the extension portion (320, 420, 730) of the first WLAN packet (300, 400, 705) such that if the length of the extension portion (320, 420, 730) is inadequate to determine the channel characteristic information for the number of antenna array configurations, it is determined to switch antenna array configurations during at least some of the data portion (315, 415) in addition to the extension portion (320,420,730). switching between a plurality of antenna array configurations during reception of a first wireless local area network, WLAN, packet (300, 400, 705), wherein the first WLAN packet (300, 400, 705) comprises a preamble (310, 410, 725), an extension portion (320, 420, 730) and a data portion (315, 415), wherein the extension portion (320, 420, 730) is appended to the first WLAN packet (300, 400, 705) after the data portion (315, 415), wherein the length of the extension portion (320, 420, 730) is signaled by the preamble (310, 410, 725); determining channel characteristic information associated with the plurality of antenna array configurations based at least in part on the reception of the first WLAN packet (300, 400, 705); transmitting a second WLAN packet using an antenna array configuration selected from the plurality of antenna array configurations based at least in part on the determined channel characteristic information; and determining a portion of the first WLAN packet (300, 400, 705) to switch antenna array configurations based at least in part on a number of antenna array configurations of the plurality of antenna array configurations and a length of the extension portion (320, 420, 730) of the first WLAN packet (300, 400, 705) such that if the length of the extension portion (320, 420, 730) is inadequate to determine the channel characteristic information for the number of antenna array configurations, it is determined to switch antenna array configurations during at least some of the data portion (315, 415) in addition to the extension portion (320,420,730).