A UHF television antenna from 1952. It is a rhombic antenna, a directional antenna which has the broad bandwidth to cover the US UHF band of 470 to 890 MHz. The rhombic is a nonresonant traveling wave antenna so the length of the elements is not critical, each of the 4 sides is several UHF wavelengths long. The antenna is composed of two wires which are connected at the near end "(upper left)" with a resistor equal to the characteristic impedance of 470 - 500 ohms, and at the far end to the 300 ohm Twin lead feedline to the TV. The beam pattern is unidirectional off the near end. It has gain of 5 dB at low end of the band rising to 10 dB.at the high end.