Are we maybe overthinking this ?
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A pair of back to back 1N4148's or a BAV99 should be perfectly adequate in a receive situation.
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I use a pair of 1N4148's across the antenna cable from my "old school" external car radio antenna, that feeds the broadcast radio, as I also use a roof mounted screwdriver HF transmit antenna that is less than a metre away, and I've not had any problems from the 100w of RF that is being radiated.
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Regards,
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Martin
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