Tested for power output all frequencies. Gain rolls off about 10dB across full band, but 3W is available 2-500 MHz. Pre-amp in this unit is a TRW block instead of the discrete design shown in the manual (which is available online). The TRW amplifier block is responsible for the roll-off. The TRW block appears to be ENI’s doing since it looks like the amplifier was originally built that way. Item pictured is actual item offered.