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diff --git a/2863/CH2/EX2.28/ex2_28.sce b/2863/CH2/EX2.28/ex2_28.sce
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+//chapter 2
+//Antenna Bandwidth=Operating Frequency/Q;
+printf("\n");
+Q=30;
+f=10*10^6;
+f0=f*Q;
+c=3*10^8;
+lamda=c/f0;
+leng=lamda/2;
+printf("the length of the half wave dipole is %gm",leng);