The X510HDM from Diamond Antenna is a Base Station Antenna with Frequency 144 to 148 MHz / 440 to 450 MHz, Frequency Band 1 144 to 148 MHz, Frequency Band 2 440 to 450 MHz, Gain 8.3 to 11.7 dBi, Power 250 to 330 W. More details for X510HDM can be seen below.