An antenna arrangement for a RF (radio frequency) signal, has: printed circuit board having first and second opposed sides; a ground plane formed on the first side of the printed circuit board; a circuit disposed on the second side of the printed circuit board; and a flat, polygonal shaped spiral member disposed on the second side of the printed circuit board, the polygonal shaped spiral member a first free end a second connection end connected to the circuit, the spiral member having a plurality of straight portions which are interconnected to form a plurality of corners.