The RFXF3553 from MiniRF is a Balun with Frequency 2 MHz to 1 GHz, Amplitude Balance ± 0.2 to 1 dB, Phase Balance 3 to 10 Degree, Insertion Loss Less than 2 dB, Power 2 W. Tags: Surface Mount, Unbalanced to Balanced. More details for RFXF3553 can be seen below.