The SY203-SF1SNM(C-ABK) from Sinclair Technologies is a Base Station Antenna with Frequency 138 to 144 MHz, Frequency Band 1 138 to 144 MHz, Gain 7.6 dBi, Vertical Beamwidth 61 Degrees, Horizontal Beamwidth 87 Degree. Tags: Yagi. More details for SY203-SF1SNM(C-ABK) can be seen below.