The long awaited Kingray MDA22WS is now in stock. This is a shielded, fixed 22dB, wideband, low noise amplifier.
This model replaces the popular Kingray MDA20 amplifier.  Like the MDA20, a DC Power is required (AC Power will not work)

Two extra models, an Unshielded, Low Noise VHF Only Model,  MDA22V and an Unshielded, Low Noise, UHF Only Model MDA22U will be arriving soon.