The M-441-881-91KWN-R from Narda-MITEQ is a 90 Degree Hybrid Coupler with Frequency 440 to 880 MHz, Average Power 1000 W, Insertion Loss 0.2 dB, Isolation 20 dB, Amplitude Balance ± 0.75 dB. Tags: Module with Connectors. More details for M-441-881-91KWN-R can be seen below.