900 Mhz Yagi Antenna. Heavy Duty 7 Element Yagi for 880-960 Mhz ISM with 12 dBi Gain. Kathrein Scala EquivalentThe RFMAX RY 900 12 7 SNF 19 is a heavy duty, Gold Anodized, 900 MHz Kathrein Scala equivalent Yagi Antenna operating within the 880 960 MHz ISM frequency range. This TY900 antenna model is the RFMAX "premium" offering, with a full IP67 rating to withstand severe outdoor weather conditions. This is suitable for 900 MHz spread spectrum applications, SCADA system radios that operate in the unlicensed 896 940 MHz frequency range and for all applaications