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+//Chapter 5: Point Source and Their Arrays
+//Example 5-21.1
+clc;
+
+//Variable Initialization
+a = 25              //Height of vertical conducting wall (m)
+r = 100             //Distance to the receiver (m)
+wave_lt = 10e-2     //Transmitter dimension (m)
+
+//Calculation
+k = sqrt(2/(r*wave_lt))    //Constant (unitless)
+S_av = (r*wave_lt)/(4*(%pi**2)*(a**2))  //Relative signal level (unitless)
+S_av_db = 10*log10(S_av)   //Signal level (in db)
+
+//Result
+mprintf("The signal level at the receiver is %.5f or %.0f dB",S_av,S_av_db)