MFJ-4712 covers 1.8 MHz-150 MHz and handles 1500 Watts. Impedance is 50-75 Ohms.The compact 4W x 2 5/8H x 1 1/2D inch Outside Switch Box is fully enclosed andweather protected. It also has three quality Teflon(R) SO-239 connectors for transmitter, antenna one and antenna two.It ...