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Check the listing for details. 4.2db Power RF Amplifier Board 50M-6000Mhz Transmitter Circuit Module SBB5089. Condition: New. Listed at 9.98 USD. RF Power Amplifier Board Transmitter Circuit Board Amplifier Module 20dB Gain 50M-6000Mhz SBB5089. Application: weak RF signal amplifier, RF power amplifier pre-amplifier. 1 x RF Amplifier Board. Dual Band WiFi Moving Antenna For ASUS Z390 Z490 X570 Motherboard 2T2R.