The RFXF3513 from MiniRF is a Balun with Frequency 0.4 to 500 MHz, Amplitude Balance ± 0.02 to 0.6 dB, Phase Balance 1 to 5 Degree, Insertion Loss Less than 3 dB, Power 2 W. Tags: Surface Mount, Unbalanced to Balanced. More details for RFXF3513 can be seen below.