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“I’d imagine coils are allowed because they would be too difficult to measure, but the vertical height of the coil is counted as part of the total length of the antenna.”
Well, that could be countered as well. If the coil is mounted horizontally in a rainproof cabinet, like the one Carl’s guest Brian on the latest LPH has, with a tuning stylus and all, it could be considered a type of ATU, and not part of the antenna proper. The antenna apparently doesn’t care if the coil is horizontal or vertical.