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A 20-meter-long T²FD antenna, covering the 5-30 MHz band. 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.
Depending on the specific requirements, various antennas (i.e. Sloper, T2FD, Dipole) can be used for NVIS communication, with horizontal dipoles or inverted V dipoles at about 1 / 5 wavelength above ground giving the best results on transmit and at about 1 / 6 wavelength on receive, according to military sources and an extensive ...
The T2FD was conceived with coax in mind from the start. At best there might have been a balun in a metal box bolted outside the superstructure, ladder on one side, coax on the other. There even are complaints voiced in the ham community in the 40's and 50s for HAVING to use low Z unbalanced on surplus mil gear while the ham tradition was open ...
A television antenna, also called a television aerial (in British English), is an antenna specifically designed for use with a television receiver (TV) to receive terrestrial over-the-air (OTA) broadcast television signals from a television station.
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A choke ring antenna is a directional antenna designed for reception of GNSS signals from satellites. It consists of a number of concentric conductive cylinders around a central antenna.
Moxon antenna for the 20-meter band.The antenna is the faint rectangle of wires held in tension by the bent X-shaped support frame. Moxon antenna for the 2-meter band. The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. [1]
In radio communication and avionics a conformal antenna or conformal array is a flat array antenna which is designed to conform or follow some prescribed shape, [1] for example a flat curving antenna which is mounted on or embedded in a curved surface.