The SY3074-SF4SNM(ABK) from Sinclair Technologies is a Base Station Antenna with Frequency 470 to 490 MHz, Frequency Band 1 470 to 490 MHz, Gain 17.1 dBi, Vertical Beamwidth 19 Degrees, Horizontal Beamwidth 22 Degree. Tags: Yagi, Array. More details for SY3074-SF4SNM(ABK) can be seen below.