The D2T offers such coverage from 1.5 to 200 MHz. The top portion of fig.1 shows the general layout of this basic antenna. One typical length is 90 ft., although longer versions up to nearly 200 ft. are available. A non-inductive resistor in the 800 to 900 ohm range provides a termination that sets the feedpoint impedance as well. Military and government services often employ such antennas to reduce the number of antennas and the number of adjustments necessary to assure that the antenna is well-matched to transmitting and receiving equipment.
Most modern receivers have excess gain to make up for the reduced overall signal strength.
Hams with limited space have used this type of antenna with success for general QSO purposes. Giovannini s innovation in this class of antennas is a further size reduction. As shown in the lower half of fig.1, the element is a continuous loop of wire formed into two parallel sections, each about 19.8 ft. long. Close-spaced and crossing wires connect the feedpoint loop with the loop holding the terminating resistor. Since the wires running front to back are closely spaced, they do not radiate significantly, although their continuously varying spacing makes a determination of their characteristic impedance a complex task.