RR Martin,
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that's exactly what I did. But the results were worse than before. I am now using 4 cables of the same length (430mm) and connected them like in the photo in the opening post (parallel). WSPR comparison has been running since midnight UTC. Unfortunately, it doesn't look like there will be any significant improvement, but let's wait until midnight (24-hour period).
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Interestingly, most of the bands (2200 - 80m) are better than my single loop. Only 40m is worse.
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73
Roland
