Compared with the antenna for the transmitter antenna to the receiver is not too difficult , even for a band as 1.9 MHz . Typically, such wire antenna is a frame that consists of one or several coils . Wire loop antennas have two distinct minimum when the signal directed perpendicular to its plane . Suppression of radio signals and interference are the side of the loop antenna can reach about 30 dB ( five points on the scale S!). An embodiment of the wire loop antenna shown in Fig . The antenna has three turns ( a square with sides 1.5 meters ) , forming a frame, and one round of communication . Any wire diameter , the usual equipment wire. The frame is placed in the electrostatic shield , open at the top. The screen can be made of braided coaxial cable , fixed to the frame cross member of the dielectric. Framed wire antenna is tuned to the operating frequency of the capacitor C1 , which must be protected moisture. To frame the receiver is connected via coaxial cable with a characteristic impedance of 50 ohms.