Coil and method of making the coil

A coil (1) which has a tube (2) with a tube wall (6) made of an electrically conductive material, the tube (2) having an inductive section (7) in which a gap (4) in the tube wall (6) is arranged, which forms the tube wall (6) in the inductive section (7) to form a helix, and wherein the tube (2) has two contact sections (8), which have a connection area (10) and at least one connection area (11) have, wherein the connection area (10) has the same contour as an adjacent section of the coil, and wherein the connection area (11) forms an electrical connection of the coil (1), and wherein the connection area (10) the connection area (11) with the inductive section (7) electrically connects. Further aspects relate to a module having a plurality of coils (1), a method for producing a coil (1) and a method for producing a module.