T2FD antenna

The tilted terminated folded dipole ('T2FD, T2FD, or TTFD), or balanced-termination folded dipole (BTFD), also known as W3HH antenna, is a general-purpose shortwave antenna developed in the late 1940s by the United States Navy. It performs reasonably well over a broad frequency range, without marked dead spots in terms of frequency or horizontal or vertical directionality.

Although inferior in terms of efficiency compared to antennas designed for narrower frequency bands and those with greater directionality (at least 30% of the RF power is lost as heat in the resistor ), its all-around performance, relatively modest size, and low cost, and the fact that it does not require complicated matching to operate with a standard shortwave transmitter, have made it popular in professional shortwave communications where ERP and gain are not concern. One example would be clear-channel low-power HF communications.

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