The present invention relates to a capacitive sensor system provided for a moving object 21. The system comprises an antenna device with a first 26 and a second portion 39 which are movable in relation to each other, the two portions 26,39 being connected in parallel for capacitive influence from the surroundings. The first portion 26 constitutes in an electrical conductive part of said moving object 21 and the second section 39 constitutes in an electrical conductive device arranged at a rest position for the moving object 21.