Concrete base for air-termination rods, for protecting smaller roof structures on flat roofs and for setting up spacers, e.g. for separate ring lines or free-standing air-termination rods in a tripod (only with a weight of 17 kg). Stackable design and adapted base plate, for air-termination rods Rd 16 mm, chamfered, tapered or DEHNiso spacers Rd 16 mm