Hy-Gain 175CA 18.000 18.100 18.200 MHz 5 elements, inches 5.0000 1.2500 1.1250 0.8750 0.6250 0.4375 0.0000 3.6250 41.8750 46.0000 25.0000 24.0000 35.8750 88.6250 3.6250 32.3750 46.0000 25.0000 24.0000 31.2500 167.2500 3.6250 32.3750 46.0000 25.0000 24.0000 28.0000 249.1250 3.6250 14.1250 46.0000 25.0000 24.0000 37.2500 407.3750 3.6250 14.1250 46.0000 25.0000 24.0000 31.7500 The pattern of this model comes within a couple dB of actual range measurements from 17.0 through 18.6 MHz.