Not a ferrite core item. Generally the antenna eliminators were a coil and capacitor tuned to the low end of the band. Your unit takes advantage of the miles of pipe in the house. It will work better on the opposite end of the house from where the service enters the house. You should be able to also use it hooked to the house electrical and telephone gnds. Also with a short antenna. You can use a set on each of two radios to buffer loading on a common longwire antenna.