Roof conductor holder for fixing additional air-termination systems such as air-termination conductors or rods on metal roofs. For roofs with clamping seam (e.g. RIB ROF Speed 500 by Zambelli), with clamping piece. When using two roof conductor holders (clamps / clamping pieces) which have been tested for the respective roof profile, a lightning current carrying capability of 100 kA (10/350 µs) is provided.