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A Yagi antenna is probably the easiest directional, high gain antenna to build. There are a bunch of different ways to build them. Here is one using a tape measure http://www.instructables.com/id/The-Tape-Measure-Antenna/

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Keep in mind that the signal from the satellite will be polarised, and that the polarisation will change as the satellite moves through the sky. To get the best results you will need to rotate your yagi to find the best polarisation.

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