A system and method for measuring the shape of an object using a magnetic induction radio sensor involves at least partially enclosing the object with a magnetic loop antenna of the magnetic induction radio sensor, where the inductance of the magnetic loop antenna depends on the shape of the object, and providing a particular capacitance at an antenna matching circuit coupled to the magnetic loop antenna in response to the inductance of the magnetic loop antenna such that the magnetic loop antenna and the antenna matching circuit form a resonant circuit and the resonant circuit has a fixed resonant frequency, where the particular capacitance is used to measure the shape of the object.