Before revision: In television, amateur radio, and other antenna installations and connections, baluns convert between impedances and symmetry of feedlines and antennas.Baluns: What They Do And How They Do It (W7EL) URL For example, transformation of 300-Ω twin-lead or 450-Ω ladder line (balanced) to 75-Ω coaxial cable (unbalanced), or to directly connect a balanced antenna to unbalanced coaxial cable.
After revision: In television, amateur radio, and other antenna installations and connections, baluns convert between impedances and symmetry of feedlines and antennas.Baluns: What They Do And How They Do It (W7EL) eznec.com For example, transformation of 300-Ω twin-lead or 450-Ω ladder line (balanced) to 75-Ω coaxial cable (unbalanced), or to directly connect a balanced antenna to unbalanced coaxial cable.