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In common with most good Yagi designs, these antennas are ' matched ' to the standard 50 ohms input impedance of radio-tracking receivers.
Since the main lobe of a single yagi is fairly wide, tilting did not help much.
The light wave talk was followed by an informative and thought provoking talk on yagi antenna construction for the 1.2 and 2.3GHz bands.
If you ca n't find your exact yagi design, you should be able to find something comparable as a guide.
Talkback on 2m was 150W into a 7 element yagi.