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+//Chapter 2: Antenna Basics
+//Example 2-10.1
+clc;
+
+//Variable Initialization
+Z = 120*%pi                 //Intrinsic impedance of free space (ohm)
+
+//Calculation
+max_aper = Z/(320*%pi**2)   //Max. effective aperture (lambda squared)
+direct = 4*%pi*max_aper     //Directivity (unitless)
+
+//Result
+mprintf("The Maximum effective aperture is %.3f lambda square",max_aper)
+mprintf("\nThe Directivity is %.1f", direct)