(i) (a) Explain Critical frequency and Virtual height. (b) Assume that reflection takes place at a height of 350 Km. The maximum density in ionosphere corresponds to refractive index of 0.8 at 15 MHz...

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Extracted text: (i) (a) Explain Critical frequency and Virtual height. (b) Assume that reflection takes place at a height of 350 Km. The maximum density in ionosphere corresponds to refractive index of 0.8 at 15 MHz frequency. What will be range for which MUF is 20 MHz. Assume flat earth. (ii) Describe radiation pattern measurement method of antenna?