Did anyone know this？
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The figure to the left is in USAF Tiger Stripe ABU, so I am assuming it is a USAF HMMWV. In that case, it is most likely part of an air to ground radio system.
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Looks like an antenna coupler
Most probably: https://www.l3harris.com/all-capabilities/rf-382-series-fast-tune-automatic-500-watt-antenna-coupler
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Ths bro，very helpful ：）
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