Answer:
For the transmission of signals, following two types of transmission systems are used. (i) Sky wave propagation or short wave propagation. (ii) Space wave communication or line of sight communication. Range of frequencies (i) Sky wave propagation \[3\,\,\text{MHz}\,\,\text{}\,\,\text{f}\,\,\text{}\left| 30\,\,\text{MHz} \right.\] (ii) Space wave communication \[30\,\,\text{MHz}\,\,\text{}\,\,\text{f}\,\,\text{}\,\,300\,\,\text{MHz}\]
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