The 0430BL15A0100 from Johanson Technology is a Balun with Frequency 400 to 460 MHz, Amplitude Balance 2.0 dB, Phase Balance 10 Degree, Insertion Loss 1.0 dB, Power 2 W. Tags: Ceramic, Surface Mount, Unbalanced to Balanced. More details for 0430BL15A0100 can be seen below.