A cross connected pair of loops, or 4 cross connected loops as described by LZ1AQ, is likely to produce better results, but you should have noticed some improvement with the parallel loops relative to a single loop.
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As it is configured at the moment, the length of one loop is considerably larger than the other, and this will result in some phase and amplitude differences.
Before you move on from this configuration, I'd try to make the connections to the amplifier from both loops to be the same length. Maybe by crossing one of the amplifier connections across to the other loop.
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Regards,
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Martin
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