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diff --git a/magloop_equations.html b/magloop_equations.html
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+++ b/magloop_equations.html
@@ -23,8 +23,10 @@
         <img src="MagloopLossResistance.png" alt="magloop multi-turn loss resistance"><br><br>
         Surface resistance:<br>
         <img src="MagloopSurfaceResistance.png" alt="magloop surface resistance of conductor"><br><br>
-        Radiation resistance:<br>
+        Radiation resistance for circular loop:<br>
         <img src="MagloopRadiationResistance.png" alt="multi-turn magloop radiation resistance"><br><br>
+        Radiation resistance for octagon, hexagon and square loop:<br>
+        <img src="MagloopRadiationResistanceGrover.png" alt="multi-turn magloop radiation resistance"><br><br>
         Radiation efficiency:<br>
         <img src="MagloopEfficiency.png" alt="magloop antenna efficiency"><br><br>
         Q factor:<br>