IEEE80211_FC1_PWR_MGT
wh->i_fc[1] &= ~(IEEE80211_FC1_WEP | IEEE80211_FC1_PWR_MGT);
wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT;
wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis");