The Helukabel 21141 is a type of coaxial cable made by Helukabel, a German-based cable, wiring, and components manufacturer. The 21141 is a mediumVOLT PREMIUM high-grade, double shielding, foamed high-density polyethylene (HDPE) cable. It is designed for the transmission of digital and TV signals at frequencies of up to 860 MHz, and is suitable for outdoor use. The outer jacket on the 21141 is UV resistant, waterproof, and flame retardant. The cable also features a copper outer braid and an aluminum inner braid for shielding against electromagnetic interference.