[Elecraft] Matching resonant antennas

[Al Lorona]

Using AC6LA's Line Loss calculator, and making the following assumptions:

Line impedance: 420 ohms,  (1/4" copper pipe spaced 4 inches apart)
SWR at antenna:  14.0  (Z = 30 ohms)
Line attenuation:  0.0266 dB/100 feet  (Duffy, "RF Two Wire Transmission Line Loss Calculator", owenduffy.net/calc/tl/twllc.htm)
Length of line:  500 feet  (conservative estimate that probably represents a worst-case?)
Frequency: 10 MHz
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Total Line Loss = 0.891 dB



>>>I've seen pictures of those SW transmitting plants and always assumed that they 
>>>must have been very efficient.  Upon reflection---no pun intended---now I'm not 
>>>so sure.