The ST221R-SF2SNF(FXXXX-CWH) from Sinclair Technologies is a Antenna with Frequency 150 to 174 MHz, Bandwidth 2 MHz, Gain 2.1 dBi, Power 300 W, Operating Temperature -40 to 60 Degree C. Tags: Low Profile. More details for ST221R-SF2SNF(FXXXX-CWH) can be seen below.