A wearable antenna for communicating between an external transceiver and a capsule inside the gastrointestinal tract of a user, including a printed circuit board for forming a conducting pattern on a first face and on a second face of the printed circuit board； a first conducting pattern on the first face of the printed circuit board, including: a) an almost completely split conducting elongated bar across a center of the printed circuit board； b) an identical main conducting transmission area on each side of the almost completely split elongated bar； c) a thin conducting line respectively connecting between each side of the almost completely split elongated bar and the transmission area； a second conducting pattern on the second face of the printed circuit board including a U shaped conductor； wherein the U shaped conductor is positioned to serve as a balun for the conducting pattern on the first face.
