Improved beamWidth calculation

RTX class/FarField.m

@@ -100,7 +100,8 @@ classdef FarField < handle
             maxIndex = find(normField == 1, 1);
             localMins = islocalmin(normField);
             localMinIndexes = find(localMins == 1);
-            beamWidth = (min(abs(localMinIndexes - maxIndex))+1)*(obj.theta(2)-obj.theta(1))*2            
+            dTheta = (obj.theta(2)-obj.theta(1));
+            beamWidth = sum(mink(abs(localMinIndexes - maxIndex), 2))*dTheta;           
         end
     end
 end