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The End Fed Half Wave Antenna - gnarc.org
If fed off center, say at 30%-70% point, impedance is approximately 200 ohms and can be used on multiple bands with an antenna tuner. Works with a 4:1 UNUN. See this link for more info. 4:1 impedance ratio is 2:1 turns ratio. If fed at the end (a.k.a EFHW), antenna impedance is in the 2000-4000 ohms range.
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