John, there is nothing wrong with flat material....except dimensional stability and wind loading.? Even for TX, people have used aluminum flashing to build loops (look up "midnight loop").? It's appealing because no special roller dies or welding/soldering are needed.? Maybe there is a small increase in AC resistance (relative to the same width rolled into a tube) due to proximity effects, but this would probably be small even for a TX loop and completely insignificant for RX as others have pointed out.? If you really want to use sheet stock and can form it into a "U" cross-section, or something similar, for mechanical stability, you'd probably be happier with the overall result.
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Dan - K3GMQ
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