MFJ invented the tunable active antenna! New technology uses a cascode FET/bipolar transistor and a gigahertz bandwidth buffer.Numerous copies have been made without success -- including most recent ones. Why? Because MFJ has made continuous improvements where others...
MFJ .3-200 MHz Active Antenna Your ham band only antenna does great in the ham bands... but plug this MFJ all-band active antenna into your radio and hear strong clear signals from all over the world from 300 kHz to 200 MHz -- including low, medium short