![9786132903853: Lecher lines: Radio frequency, Transmission line, Ultra high frequency, SHF, Impedance matching, High frequency, VHF: 6132903852 - AbeBooks 9786132903853: Lecher lines: Radio frequency, Transmission line, Ultra high frequency, SHF, Impedance matching, High frequency, VHF: 6132903852 - AbeBooks](https://pictures.abebooks.com/isbn/9786132903853-us.jpg)
9786132903853: Lecher lines: Radio frequency, Transmission line, Ultra high frequency, SHF, Impedance matching, High frequency, VHF: 6132903852 - AbeBooks
Long range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen, the frequency of the radio waves must be in the range
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