active antenna provides an amplified receive antenna giving performance equivalent to a much longer wire antenna. It is useful for Ham, shortwave, AM broadcast, and low frequency (lowfer) reception. It can also be used as a local sense antenna in a noise canceling diversity reception system. Useful frequency range of approximately 100KHz to over 200Mhz. Onboard 9V battery supply. power switch and LED power indicator. Includes a 38.18 inch (97 cm) telescoping antenna. Board Size 2.5 x 3.5 Inches (64 x 89mm)