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That "492 x VF / f = electrical 1/2 wave length" is the way to do it. 18 feet has no relation to an electrical 1/2 wave length for any typical coax on the market. That length is a length that most manufacturers found to be 'right' for a typical mobile antenna's feed line. It has nothing to do with wave length, it does have to do with the typical run distance between a mobile antenna and the radio, plus a couple of feet just in case. That 18 feet thingy has no 'special' significance at 27 Mhz but people have sure made it one'a them "magic" numbers that's supposed to 'cure' almost everything.
- 'Doc

[QUOTE="W5LZ, post: 337951, member: 129"] That "492 x VF / f = electrical 1/2 wave length" is the way to do it. 18 feet has no relation to an electrical 1/2 wave length for any typical coax on the market. That length is a length that most manufacturers found to be 'right' for a typical mobile antenna's feed line. It has nothing to do with wave length, it does have to do with the typical run distance between a mobile antenna and the radio, plus a couple of feet just in case. That 18 feet thingy has no 'special' significance at 27 Mhz but people have sure made it one'a them "magic" numbers that's supposed to 'cure' almost everything. - 'Doc [/QUOTE]

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