Circular, rhombic, square and rectangular loop antennas are widely used in practice, especially as receiving TV antennas [1–3]. The radiation impedance of a circular loop antenna is equal to 132 Ω, whereas the impedance of a square antenna is 122 Ω. This matches quite well a 75-Ω cable and allows one to use a double loop (z-antennas for TV program reception). When using square loop antennas with sides a and b, it is possible to change the radiation impedance and, as a consequence, the input impedance in the wide range from 30 Ω to 300 Ω. When the height of the loop is small (small values of b), the antenna becomes a folded dipole antenna. The polarization of the loop antenna radiation in the principal planes coincides with the direction of the electrical field at the input terminals.