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Query: four metres
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An option for restricted and limited space, to operate the six meters band with an indoor three elements yagi antenna by Brian Williams -
The HB9CV is a well known two element antenna of a directional beam type with a forward gain of 4 to 5 dBd. This one is for two metres but it can be scaled, from the dimensions in the diagram, for other bands I have also made them for four and six metres -
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The Four Metres website offer a global overview graph of the four meter band plans world wide -
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This design makes the most of having to put an aerial in the attic. This inverted-vee yagi is giving good results at GW0GHF. Directive gain is about 6 dBd. The front-to-back ratio is not brilliant, about 20 dBd.