text: Communications
  LONG-WIRE ANTENNA
  6-111. A long-wire antenna is one that is at least as long as one wavelength (Figure 6-16). However, it
  should be longer to achieve good gain and directional characteristics. Constructing long-wire antennas is
  simple, but using the correct dimensions and making the correct adjustments are both critical to its success.
  Figure 6-16. Long-wire antenna.
  Direction
  6-112. A long-wire antenna is made directional by placing a terminating resistor at the distant station end
  of the antenna. The terminating resistor should be a 600-ohm, noninductive resistor that can absorb at least
  one-half of the transmitter power. Terminating resistors are part of some radio sets, but can be made locally
  using a 100-watt, 106-ohm resistor (NSN 5905-00-764-5573).
  Construction
  6-113. Building a long-wire antenna only requires wire, support poles, insulators, and a terminating
  resistor (if directionality is desired). The only other requirement is that the operator string the antenna in as
  straight a line as the situation permits. Because the antenna is less than 20 feet tall, it requires no tall
  support structures.
  SLOPING WIRE
  6-114. If an HF circuit is only a single point-to-point ground link or a short skywave link, and if all other
  stations are oriented in the same direction, then the team can use a sloping wire antenna (Figure 6-17). The
  radiating wire is normally one quarter of the wavelength. (Antenna length is measured from the radio
  equipment.) The far end of the antenna should be connected to a rope whose other end is tied to a
  nonconductive weight such as a stone or brick. The weighted end is then thrown over a tree so that the
  antenna forms a 30- to 45-degree angle to the ground. Angles greater than 45 degrees are used for ground
  waves, and less than 30 degrees for sky waves. The angle formed by the wire should point in the direction
  opposite that of the intended receiver.