Hello Nicolas,

With a higher diameter you get more L at less turns, so more volts per turn. This makes it necessary to use a better wire insulation or a higher wire spacing, depending on the power. Keeping the coil dry is important, no matter what wire you use. Thus i have to go immediately QRT on VLF when it starts to rain. On LF, it is enough just to cover the coil by a trash bag...

73 and GL, Stefan/DK7FC