This was one of the first antenna coupler projects I built. It was described by W9SCH in Sprat (and the G QRP Club Circuit Handbook). It's very simple, needing only one variable capacitor. It also covers a wide range, from 160 to 10 metres.
I built is nearly 30 years ago. Recently I fired it up to see if it still worked. It did! Not only that but it operated on more bands than I envisaged when I built it. It matched an end-fed 20m wire perfectly on all bands with only a slight difficulty on 40m (where the wire's impedance would have been very high). You could make it slightly shorter or longer to resolve that.
I built is nearly 30 years ago. Recently I fired it up to see if it still worked. It did! Not only that but it operated on more bands than I envisaged when I built it. It matched an end-fed 20m wire perfectly on all bands with only a slight difficulty on 40m (where the wire's impedance would have been very high). You could make it slightly shorter or longer to resolve that.
This is my video describing and demonstrating it.
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