Index: openwrt/package/kernel/mac80211/patches/569-dynack-aredn-long-dist-defaults.patch
===================================================================
--- /dev/null
+++ openwrt/package/kernel/mac80211/patches/569-dynack-aredn-long-dist-defaults.patch
@@ -0,0 +1,32 @@
+--- a/drivers/net/wireless/ath/ath9k/dynack.c
++++ b/drivers/net/wireless/ath/ath9k/dynack.c
+@@ -21,7 +21,8 @@
+ #define COMPUTE_TO		(5 * HZ)
+ #define LATEACK_DELAY		(10 * HZ)
+ #define LATEACK_TO		256
+-#define MAX_DELAY		300
++/* AREDN max distance set to 150km */
++#define MAX_DELAY		1054	
+ #define EWMA_LEVEL		96
+ #define EWMA_DIV		128
+ 
+@@ -293,7 +294,8 @@
+ void ath_dynack_node_init(struct ath_hw *ah, struct ath_node *an)
+ {
+ 	/* ackto = slottime + sifs + air delay */
+-	u32 ackto = 9 + 16 + 64;
++	/* AREDN starting point is 20km */
++	u32 ackto = 9 + 16 + 171;
+ 	struct ath_dynack *da = &ah->dynack;
+ 
+ 	an->ackto = ackto;
+@@ -328,7 +330,8 @@
+ void ath_dynack_reset(struct ath_hw *ah)
+ {
+ 	/* ackto = slottime + sifs + air delay */
+-	u32 ackto = 9 + 16 + 64;
++	/* AREDN starting point is 20km */
++	u32 ackto = 9 + 16 + 171;
+ 	struct ath_dynack *da = &ah->dynack;
+ 
+ 	da->lto = jiffies;
Index: openwrt/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
===================================================================
--- openwrt.orig/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
+++ openwrt/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
@@ -788,7 +788,11 @@ drv_mac80211_setup() {
 
 	iw phy "$phy" set antenna $txantenna $rxantenna >/dev/null 2>&1
 	iw phy "$phy" set antenna_gain $antenna_gain
-	iw phy "$phy" set distance "$distance"
+	if [ $distance -eq 0 -a -d /sys/kernel/debug/ieee80211/$phy/ath9k ]; then
+		iw phy "$phy" set distance auto
+	else
+		iw phy "$phy" set distance "$distance"
+	fi
 
 	[ -n "$frag" ] && iw phy "$phy" set frag "${frag%%.*}"
 	[ -n "$rts" ] && iw phy "$phy" set rts "${rts%%.*}"