This MFJ Model MFJ-66 is a set of HF/VHF Dip Meter Coils intended for use with MFJ SWR Analyzers. These coils are made by MFJ, a trusted brand in the radio communication industry. They are compatible with most brands and types of antennas and are particularly useful for measuring VHF connectivity. The MFJ Model MFJ-66 is an excellent choice for anyone in need of reliable and high-quality dip meter coils.This is NOS.