diff --git a/src/wifi/model/he/rr-multi-user-scheduler.cc b/src/wifi/model/he/rr-multi-user-scheduler.cc
index d3ec4de77..6501f2ca0 100644
--- a/src/wifi/model/he/rr-multi-user-scheduler.cc
+++ b/src/wifi/model/he/rr-multi-user-scheduler.cc
@@ -320,7 +320,8 @@ RrMultiUserScheduler::TrySendingBsrpTf()
     m_txParams.Clear();
     // set the TXVECTOR used to send the Trigger Frame
     m_txParams.m_txVector =
-        m_apMac->GetWifiRemoteStationManager(m_linkId)->GetRtsTxVector(m_triggerMacHdr.GetAddr1());
+        m_apMac->GetWifiRemoteStationManager(m_linkId)->GetRtsTxVector(m_triggerMacHdr.GetAddr1(),
+                                                                       m_allowedWidth);
 
     if (!GetHeFem(m_linkId)->TryAddMpdu(item, m_txParams, m_availableTime))
     {
@@ -442,7 +443,8 @@ RrMultiUserScheduler::TrySendingBasicTf()
     m_txParams.Clear();
     // set the TXVECTOR used to send the Trigger Frame
     m_txParams.m_txVector =
-        m_apMac->GetWifiRemoteStationManager(m_linkId)->GetRtsTxVector(m_triggerMacHdr.GetAddr1());
+        m_apMac->GetWifiRemoteStationManager(m_linkId)->GetRtsTxVector(m_triggerMacHdr.GetAddr1(),
+                                                                       m_allowedWidth);
 
     if (!GetHeFem(m_linkId)->TryAddMpdu(item, m_txParams, m_availableTime))
     {
diff --git a/src/wifi/model/qos-frame-exchange-manager.cc b/src/wifi/model/qos-frame-exchange-manager.cc
index 8549c3b9b..3c9d98fac 100644
--- a/src/wifi/model/qos-frame-exchange-manager.cc
+++ b/src/wifi/model/qos-frame-exchange-manager.cc
@@ -97,7 +97,8 @@ QosFrameExchangeManager::SendCfEndIfNeeded()
     cfEnd.SetAddr1(Mac48Address::GetBroadcast());
     cfEnd.SetAddr2(m_self);
 
-    WifiTxVector cfEndTxVector = GetWifiRemoteStationManager()->GetRtsTxVector(cfEnd.GetAddr1());
+    WifiTxVector cfEndTxVector =
+        GetWifiRemoteStationManager()->GetRtsTxVector(cfEnd.GetAddr1(), m_allowedWidth);
 
     auto mpdu = Create<WifiMpdu>(Create<Packet>(), cfEnd);
     auto txDuration =
diff --git a/src/wifi/model/wifi-default-ack-manager.cc b/src/wifi/model/wifi-default-ack-manager.cc
index ca286330b..0e27d77f7 100644
--- a/src/wifi/model/wifi-default-ack-manager.cc
+++ b/src/wifi/model/wifi-default-ack-manager.cc
@@ -572,7 +572,9 @@ WifiDefaultAckManager::GetAckInfoIfTfMuBar(Ptr<const WifiMpdu> mpdu,
                                           m_mac->GetBaTypeAsOriginator(receiver, tid)});
 
         acknowledgment->barTypes.push_back(m_mac->GetBarTypeAsOriginator(receiver, tid));
-        acknowledgment->muBarTxVector = GetWifiRemoteStationManager()->GetRtsTxVector(receiver);
+        acknowledgment->muBarTxVector =
+            GetWifiRemoteStationManager()->GetRtsTxVector(receiver,
+                                                          txParams.m_txVector.GetChannelWidth());
         acknowledgment->SetQosAckPolicy(receiver, tid, WifiMacHeader::BLOCK_ACK);
         return std::unique_ptr<WifiDlMuTfMuBar>(acknowledgment);
     }
diff --git a/src/wifi/model/wifi-default-protection-manager.cc b/src/wifi/model/wifi-default-protection-manager.cc
index 69d684de9..6dc833b8e 100644
--- a/src/wifi/model/wifi-default-protection-manager.cc
+++ b/src/wifi/model/wifi-default-protection-manager.cc
@@ -207,7 +207,9 @@ WifiDefaultProtectionManager::GetPsduProtection(const WifiMacHeader& hdr,
     if (emlsrNeedRts || GetWifiRemoteStationManager()->NeedRts(hdr, size))
     {
         auto protection = std::make_unique<WifiRtsCtsProtection>();
-        protection->rtsTxVector = GetWifiRemoteStationManager()->GetRtsTxVector(hdr.GetAddr1());
+        protection->rtsTxVector =
+            GetWifiRemoteStationManager()->GetRtsTxVector(hdr.GetAddr1(),
+                                                          txVector.GetChannelWidth());
         protection->ctsTxVector =
             GetWifiRemoteStationManager()->GetCtsTxVector(hdr.GetAddr1(),
                                                           protection->rtsTxVector.GetMode());
@@ -301,7 +303,8 @@ WifiDefaultProtectionManager::TryAddMpduToMuPpdu(Ptr<const WifiMpdu> mpdu,
             }
 
             // compute the TXVECTOR to use to send the MU-RTS Trigger Frame
-            protection->muRtsTxVector = GetWifiRemoteStationManager()->GetRtsTxVector(receiver);
+            protection->muRtsTxVector =
+                GetWifiRemoteStationManager()->GetRtsTxVector(receiver, txWidth);
             // The transmitter of an MU-RTS Trigger frame shall not request a non-AP STA to send
             // a CTS frame response in a 20 MHz channel that is not occupied by the PPDU that
             // contains the MU-RTS Trigger frame. (Sec. 26.2.6.2 of 802.11ax)
@@ -391,7 +394,7 @@ WifiDefaultProtectionManager::TryUlMuTransmission(Ptr<const WifiMpdu> mpdu,
 
     // compute the TXVECTOR to use to send the MU-RTS Trigger Frame
     protection->muRtsTxVector =
-        GetWifiRemoteStationManager()->GetRtsTxVector(mpdu->GetHeader().GetAddr1());
+        GetWifiRemoteStationManager()->GetRtsTxVector(mpdu->GetHeader().GetAddr1(), txWidth);
     // The transmitter of an MU-RTS Trigger frame shall not request a non-AP STA to send
     // a CTS frame response in a 20 MHz channel that is not occupied by the PPDU that
     // contains the MU-RTS Trigger frame. (Sec. 26.2.6.2 of 802.11ax)
diff --git a/src/wifi/model/wifi-remote-station-manager.cc b/src/wifi/model/wifi-remote-station-manager.cc
index 2ec797f2c..90e3ca29d 100644
--- a/src/wifi/model/wifi-remote-station-manager.cc
+++ b/src/wifi/model/wifi-remote-station-manager.cc
@@ -701,13 +701,13 @@ WifiRemoteStationManager::GetCtsToSelfTxVector()
 }
 
 WifiTxVector
-WifiRemoteStationManager::GetRtsTxVector(Mac48Address address)
+WifiRemoteStationManager::GetRtsTxVector(Mac48Address address, uint16_t allowedWidth)
 {
-    NS_LOG_FUNCTION(this << address);
+    NS_LOG_FUNCTION(this << address << allowedWidth);
+    WifiTxVector v;
     if (address.IsGroup())
     {
         WifiMode mode = GetNonUnicastMode();
-        WifiTxVector v;
         v.SetMode(mode);
         v.SetPreambleType(
             GetPreambleForTransmission(mode.GetModulationClass(), GetShortPreambleEnabled()));
@@ -717,9 +717,31 @@ WifiRemoteStationManager::GetRtsTxVector(Mac48Address address)
         v.SetNTx(GetNumberOfAntennas());
         v.SetNss(1);
         v.SetNess(0);
-        return v;
     }
-    return DoGetRtsTxVector(Lookup(address));
+    else
+    {
+        v = DoGetRtsTxVector(Lookup(address));
+    }
+    auto modulation = v.GetModulationClass();
+
+    if (allowedWidth >= 40 &&
+        (modulation == WIFI_MOD_CLASS_DSSS || modulation == WIFI_MOD_CLASS_HR_DSSS))
+    {
+        // RTS must be sent in a non-HT duplicate PPDU because it must protect a frame being
+        // transmitted on at least 40 MHz. Change the modulation class to ERP-OFDM and the rate
+        // to 6 Mbps
+        v.SetMode(ErpOfdmPhy::GetErpOfdmRate6Mbps());
+        modulation = v.GetModulationClass();
+    }
+    // do not set allowedWidth as the TX width if the modulation class is (HR-)DSSS (allowedWidth
+    // may be >= 40 MHz) or allowedWidth is 22 MHz (the selected modulation class may be OFDM)
+    if (modulation != WIFI_MOD_CLASS_DSSS && modulation != WIFI_MOD_CLASS_HR_DSSS &&
+        allowedWidth != 22)
+    {
+        v.SetChannelWidth(allowedWidth);
+    }
+
+    return v;
 }
 
 WifiTxVector
diff --git a/src/wifi/model/wifi-remote-station-manager.h b/src/wifi/model/wifi-remote-station-manager.h
index c4e35e351..a5067db08 100644
--- a/src/wifi/model/wifi-remote-station-manager.h
+++ b/src/wifi/model/wifi-remote-station-manager.h
@@ -816,11 +816,12 @@ class WifiRemoteStationManager : public Object
     WifiTxVector GetDataTxVector(const WifiMacHeader& header, uint16_t allowedWidth);
     /**
      * \param address remote address
+     * \param allowedWidth the allowed width in MHz for the data frame being protected
      *
      * \return the TXVECTOR to use to send the RTS prior to the
      *         transmission of the data packet itself.
      */
-    WifiTxVector GetRtsTxVector(Mac48Address address);
+    WifiTxVector GetRtsTxVector(Mac48Address address, uint16_t allowedWidth);
     /**
      * Return a TXVECTOR for the CTS frame given the destination and the mode of the RTS
      * used by the sender.
diff --git a/src/wifi/test/wifi-emlsr-test.cc b/src/wifi/test/wifi-emlsr-test.cc
index 2380344bd..361e1c0ab 100644
--- a/src/wifi/test/wifi-emlsr-test.cc
+++ b/src/wifi/test/wifi-emlsr-test.cc
@@ -2026,7 +2026,8 @@ EmlsrDlTxopTest::CheckBlockAck(const WifiConstPsduMap& psduMap,
     auto txDuration = WifiPhy::CalculateTxDuration(psduMap, txVector, apPhy->GetPhyBand());
     auto cfEndTxDuration = WifiPhy::CalculateTxDuration(
         Create<WifiPsdu>(Create<Packet>(), WifiMacHeader(WIFI_MAC_CTL_END)),
-        m_apMac->GetWifiRemoteStationManager(linkId)->GetRtsTxVector(Mac48Address::GetBroadcast()),
+        m_apMac->GetWifiRemoteStationManager(linkId)->GetRtsTxVector(Mac48Address::GetBroadcast(),
+                                                                     txVector.GetChannelWidth()),
         apPhy->GetPhyBand());
 
     m_countBlockAck++;
diff --git a/src/wifi/test/wifi-mac-ofdma-test.cc b/src/wifi/test/wifi-mac-ofdma-test.cc
index c10288967..0deef55af 100644
--- a/src/wifi/test/wifi-mac-ofdma-test.cc
+++ b/src/wifi/test/wifi-mac-ofdma-test.cc
@@ -186,7 +186,8 @@ TestMultiUserScheduler::SelectTxFormat()
         m_txParams.Clear();
         // set the TXVECTOR used to send the Trigger Frame
         m_txParams.m_txVector =
-            m_apMac->GetWifiRemoteStationManager()->GetRtsTxVector(m_triggerHdr.GetAddr1());
+            m_apMac->GetWifiRemoteStationManager()->GetRtsTxVector(m_triggerHdr.GetAddr1(),
+                                                                   m_allowedWidth);
 
         if (!GetHeFem(SINGLE_LINK_OP_ID)->TryAddMpdu(item, m_txParams, m_availableTime) ||
             (m_availableTime != Time::Min() &&