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Select *EITHER* a combo 7-69 antenna *OR* a combination of two antennas, one for high-VHF 7-13 and a separate UHF antenna combined with the UVSJ.
Beyond the PA18, you might look into one of the ultra-low noise amps from RC or Kitz. While I haven't done any testing of either of them and I'm not recommending them, their published specs would indicate the potential of up to a 1.5 to 2 dB dB improvement in the system noise figure.
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