diff --git a/src/antenna/model/isotropic-antenna-model.cc b/src/antenna/model/isotropic-antenna-model.cc
index 86f9d3db2..65aefc910 100644
--- a/src/antenna/model/isotropic-antenna-model.cc
+++ b/src/antenna/model/isotropic-antenna-model.cc
@@ -20,11 +20,13 @@
 
 
 #include <ns3/log.h>
+#include <ns3/double.h>
 
 #include "antenna-model.h"
 #include "isotropic-antenna-model.h"
 
 
+
 namespace ns3 {
 
 NS_LOG_COMPONENT_DEFINE ("IsotropicAntennaModel");
@@ -39,6 +41,11 @@ IsotropicAntennaModel::GetTypeId ()
     .SetParent<AntennaModel> ()
     .SetGroupName("Antenna")
     .AddConstructor<IsotropicAntennaModel> ()
+    .AddAttribute ("Gain",
+                   "The gain of the antenna in dB",
+                   DoubleValue (0),
+                   MakeDoubleAccessor (&IsotropicAntennaModel::m_gainDb),
+                   MakeDoubleChecker<double> ())
   ;
   return tid;
 }
@@ -52,7 +59,7 @@ double
 IsotropicAntennaModel::GetGainDb (Angles a)
 {
   NS_LOG_FUNCTION (this << a);
-  return 0.0;
+  return m_gainDb;
 }
 
 }
diff --git a/src/antenna/model/isotropic-antenna-model.h b/src/antenna/model/isotropic-antenna-model.h
index 2fe895910..8288d30a4 100644
--- a/src/antenna/model/isotropic-antenna-model.h
+++ b/src/antenna/model/isotropic-antenna-model.h
@@ -30,7 +30,7 @@ namespace ns3 {
 /**
  * \brief Isotropic antenna model
  * 
- * This is the simplest antenna model. The gain of this antenna is unitary (=0dB) in all directions.
+ * This is the simplest antenna model. The gain of this antenna is the same in all directions.
  */
 class IsotropicAntennaModel : public AntennaModel
 {
@@ -42,6 +42,14 @@ public:
 
   // inherited from AntennaModel
   virtual double GetGainDb (Angles a);
+
+protected:
+
+  /**
+   * gain of the antenna in dB, in all directions
+   * 
+   */
+  double m_gainDb;
 };