HOLLAND CISP Coaxial Cable Isolator with Spike Protection
Blocks 60 Hz Power up to 5,000 Volts Reduces the Energy Level of Spikes Eliminates Ground Loop Hum Available with Spike Protection Circuitry (CISP).

The CISP separates the coaxial cable ground for DC and low frequency currents while being shielded and transparent to RF signals over 5MHz. It is used by most major cable TV companies around the world where home grounding is not successful and device damage and shock potentials are possible.