The coil (100) has a retainer (70) for retaining the coil, where the retainer has an inner surface, which is turned towards an object, and an outer surface (76). A high frequency (HF) conductor (72) is arranged adjacent to the retainer, and has an inner surface (78), where the outer surface of the conductor and the retainer is the same. A vibration separating layer (82) is fastened at the inner surface of the conductor and the outer surface of the retainer between the conductor and the retainer, where the layer is made of a soft foam material.