Matches HF mobile antennas (ham sticks, screwdrivers, etc.) 10-80 Meters by adding L (inductance) from the feedpoint to ground to form L-network with antenna. 11 values of switchable inductance. .2 æH - 12 æH. Handles 200 Watts. SO-239
connectors. 4"W x 3-1/4"H x 1-3/4"D.