diff -Naur madwifi/ath/if_ath.c madwifi_rawtx/ath/if_ath.c
--- madwifi/ath/if_ath.c	2008-06-24 17:20:58.000000000 -0400
+++ madwifi_rawtx/ath/if_ath.c	2008-06-24 17:20:12.000000000 -0400
@@ -2950,6 +2950,7 @@
 ath_tx_startraw(struct net_device *dev, struct ath_buf *bf, struct sk_buff *skb)
 {
 	struct ath_softc *sc = dev->priv;
+	struct ieee80211com *ic = &sc->sc_ic;
 	struct ath_hal *ah = sc->sc_ah;
 	struct ieee80211_phy_params *ph = &(SKB_CB(skb)->phy); 
 	const HAL_RATE_TABLE *rt;
@@ -2962,7 +2963,8 @@
 	struct ieee80211_frame *wh;
 
 	wh = (struct ieee80211_frame *)skb->data;
-	try0 = ph->try[0];
+//	try0 = ph->try[0];
+	try0 = (ic->ic_opmode == IEEE80211_M_MONITOR) ? 1 : ph->try[0];
 	rt = sc->sc_currates;
 	txrate = dot11_to_ratecode(sc, rt, ph->rate[0]);
 	power = ph->power > 60 ? 60 : ph->power;
@@ -2986,7 +2988,8 @@
 	rt = sc->sc_currates;
 	KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
 
-	if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
+	if (IEEE80211_IS_MULTICAST(wh->i_addr1) || ((ic->ic_opmode == 
+IEEE80211_M_MONITOR) && (skb->data[1]&3) != 0x01) ) {
 		flags |= HAL_TXDESC_NOACK;	/* no ack on broad/multicast */
 		sc->sc_stats.ast_tx_noack++;
 		try0 = 1;