diff --git a/radio/src/datastructs.h b/radio/src/datastructs.h
index 3b3574016..5ac1a1f65 100644
--- a/radio/src/datastructs.h
+++ b/radio/src/datastructs.h
@@ -656,7 +656,7 @@ PACK(struct ModuleData {
   union {
     struct {
       int8_t  delay:6;
-      uint8_t pulsePol:1;      // For PXX: false = internal antenna, true = external antenna
+      uint8_t pulsePol:1;
       uint8_t outputType:1;    // false = open drain, true = push pull
       int8_t  frameLength;
     } ppm;
@@ -666,6 +666,12 @@ PACK(struct ModuleData {
       uint8_t lowPowerMode:1;
       int8_t optionValue;
     } multi);
+    NOBACKUP(struct {
+      uint8_t spare:6;
+      uint8_t external_antenna:1; // false = internal antenna, true = external antenna
+      uint8_t spare2:1;
+      uint8_t spare3;
+    } pxx);
   };
 });
 
diff --git a/radio/src/gui/480x272/model_setup.cpp b/radio/src/gui/480x272/model_setup.cpp
index 7ec878b8a..38a9366b0 100644
--- a/radio/src/gui/480x272/model_setup.cpp
+++ b/radio/src/gui/480x272/model_setup.cpp
@@ -227,7 +227,7 @@ bool menuModelSetup(event_t event)
   bool newAntennaSel;
   if (warningResult) {
     warningResult = 0;
-    g_model.moduleData[INTERNAL_MODULE].ppm.pulsePol = XJT_EXTERNAL_ANTENNA;
+    g_model.moduleData[INTERNAL_MODULE].pxx.external_antenna = XJT_EXTERNAL_ANTENNA;
   }
 
   MENU(STR_MENUSETUP, MODEL_ICONS, menuTabModel, MENU_MODEL_SETUP, ITEM_MODEL_SETUP_MAX,
@@ -567,14 +567,14 @@ bool menuModelSetup(event_t event)
 
       case ITEM_MODEL_INTERNAL_MODULE_ANTENNA:
         lcdDrawText(MENUS_MARGIN_LEFT, y, STR_ANTENNASELECTION);
-        newAntennaSel = editChoice(MODEL_SETUP_2ND_COLUMN, y, STR_VANTENNATYPES, g_model.moduleData[INTERNAL_MODULE].ppm.pulsePol, 0, 1, attr, event);
-        if (newAntennaSel != g_model.moduleData[INTERNAL_MODULE].ppm.pulsePol && newAntennaSel == XJT_EXTERNAL_ANTENNA) {
+        newAntennaSel = editChoice(MODEL_SETUP_2ND_COLUMN, y, STR_VANTENNATYPES, g_model.moduleData[INTERNAL_MODULE].pxx.external_antenna, 0, 1, attr, event);
+        if (newAntennaSel != g_model.moduleData[INTERNAL_MODULE].pxx.external_antenna && newAntennaSel == XJT_EXTERNAL_ANTENNA) {
           POPUP_CONFIRMATION(STR_ANTENNACONFIRM1);
           const char * w = STR_ANTENNACONFIRM2;
           SET_WARNING_INFO(w, strlen(w), 0);
         }
         else {
-          g_model.moduleData[INTERNAL_MODULE].ppm.pulsePol = newAntennaSel;
+          g_model.moduleData[INTERNAL_MODULE].pxx.external_antenna = newAntennaSel;
         }
         break;
 
diff --git a/radio/src/pulses/pxx_arm.cpp b/radio/src/pulses/pxx_arm.cpp
index b2578fa77..10ddcb755 100644
--- a/radio/src/pulses/pxx_arm.cpp
+++ b/radio/src/pulses/pxx_arm.cpp
@@ -377,7 +377,7 @@ void setupPulsesPXX(uint8_t port)
 #if defined(PCBHORUS)
   uint8_t antenna = XJT_INTERNAL_ANTENNA;
   if (port == INTERNAL_MODULE) {
-    antenna = g_model.moduleData[INTERNAL_MODULE].ppm.pulsePol;
+    antenna = g_model.moduleData[INTERNAL_MODULE].pxx.external_antenna;
   }
   putPcmByte(port, antenna);
 #else