The APTW8-20202120-135K10-42 from AmpliTech, Inc. is a RF Amplifier with Frequency 20.2 to 21.2 GHz, Gain 50 dB, Gain Flatness ±0.75 dB, Noise Figure 1.70 dB. Tags: Drop-In, Low Noise Amplifier. More details for APTW8-20202120-135K10-42 can be seen below.