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  2. Moxon antenna - Wikipedia

    en.wikipedia.org/wiki/Moxon_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]

  3. 2-meter band - Wikipedia

    en.wikipedia.org/wiki/2-meter_band

    The 2-meter amateur radio band is a portion of the VHF radio spectrum that comprises frequencies stretching from 144 MHz to 148 MHz [1] in International Telecommunication Union region (ITU) Regions 2 (North and South America plus Hawaii) and 3 (Asia and Oceania) [2] [3] and from 144 MHz to 146 MHz in ITU Region 1 (Europe, Africa, and Russia).

  4. Antenna types - Wikipedia

    en.wikipedia.org/wiki/Antenna_types

    Vertically polarized outgoing radiation is important for long-distance transmissions in the mediumwaves and lower: The ground waves that carry radio signals at frequencies below about 2 MHz must be vertically polarized to reduce signal absorption by the Earth. [2] Large vertical monopole antennas are used for broadcasting in the lower half of ...

  5. Amateur radio direction finding - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_direction...

    The radio equipment carried by competitors on a course must be capable of receiving the signal being transmitted by the five transmitters and useful for radio direction finding, including a radio receiver, attenuator, and directional antenna. Most equipment designs integrate all three components into one handheld device.

  6. Amateur radio repeater - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_repeater

    Repeaters are found mainly in the VHF 6-meter (50–54 MHz), 2-meter (144–148 MHz), 1.25-meter band (1 1 ⁄ 4 meters) (220–225 MHz) and the UHF 70 centimeter (420–450 MHz) bands, but can be used on almost any frequency pair above 28 MHz. In some areas, 33 centimeters (902–928 MHz) and 23 centimeters (1.24–1.3 GHz) are also used for ...

  7. Shortwave broadband antenna - Wikipedia

    en.wikipedia.org/wiki/Shortwave_broadband_antenna

    A restively terminated antenna designed and developed in the early 1990s by Graham Robinson [d] and John Barnes that has gained some attention for its wide 4 octave bandwidth (2–30 MHz). One antenna can cover essentially the whole shortwave band – useful for commercial and military stations with limited ground space, which can compensate ...

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