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Actually the gain of psa4-5043+ at UHF (400 MHz) is 22dB but circuit board has a couple of attenuators on it. Here is the block diagram;

Lat-1+PSA4-5043+Lat-2+MVA-2000(Variable Attenuator)4 way PD

MVA-2000 is the output of our PCB amplifier circuit, then output of that board goes to the input of 4 way PD PCB board. As i said it has about 5dB gain on VNA when we test it.