MFJ-1778 G5RV Multi-Band Antenna

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MFJ-1778 G5RV Multi-Band Antenna

MFJ G5RV Multi-Band Antenna


  • Covers all bands, 160-10 Meters with antenna tuner.
  • 102 feet long, shorter than 80 Meter dipole.
  • Use as inverted vee or sloper to be more compact.
  • Use on 160 Meters as Marconi with tuner and ground. Handles full legal limit power. A
  • dd coax feedline -- get on the air!


The G5RV antenna is a multi-band center-fed dipole antenna capable of 1500 Watts.

  • It was originally designed to operate as a 3/2 wavelength center fed antenna for 14 MHz, but amateurs soon discovered it would offer reasonable performance on many other bands.
  • The MFJ-1778 (G5RV) consists of a 102 foot flat top fed with a 32.5 foot 450 ohm matching section ending in an SO-239 coaxial connector.
  • The 450 ohm balanced transmission line serves as a 1:1 transmission line transformer on 14 MHz.
  • The SWR is approximately 2:1 at 14 MHz. The same balanced line section acts like a transmission line impedance matching section on the other HF bands.


This antenna generally requires the use of a suitable matching network (antenna tuner) since the SWR of the G5RV is almost certainly not 1:1 on any band. The use of a tuner will guarantee maximum performance from solid state exciters. The G5RV is a balanced antenna that is fed by an unbalanced coaxial line. This feed system causes unwanted parallel RF currents to appear on the shield of the coaxial feedline. A choke type balun should be used with this antenna to eliminate or reduce the undesirable parallel feedline currents. Failure to use a choke balun may result in RFI, RF feedback, or other symptoms of RF "in the shack".

The Balun Requirement section describes how to construct a choke balun for this antenna.

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