The RFXF6553 from MiniRF is a Balun with Frequency 10 MHz to 1.9 GHz, Amplitude Balance ± 1 to 2 dB, Phase Balance 8 to 15 Degree, Insertion Loss Less than 3 dB, Power 2 W. Tags: Surface Mount, Unbalanced to Balanced. More details for RFXF6553 can be seen below.