The Magnetic Loop: A Big Signal From a Small Circle A magnetic loop trades efficiency for silence and size. This guide explains how the small transmitting loop works and where it shines. Quick facts Diameter ~1 metre Tuning vacuum / air capacitor Voltage very high - care Nulls off the sides Best homes noisy, small lots The loop responds to the magnetic field, shrugging off much of the electric-field noise that plagues urban stations. Losses are real but so is the quiet: on a city balcony, the loop often hears what the dipole cannot. Free tool and guides: Morse Code Translator Morse Code Works - free Morse code tools and guides. Reference chart