MFJ-1778M Wire antenna 40m-10m G5RV Jr dipole

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MFJ-1778M Wire antenna 40m-10m G5RV Jr Dipole

MFJ-1778M  G5RV Junior HF Antenna

The MFJ-1778M antenna is a multi-band center-fed dipole antenna capable of 1500 Watts. It consists of 52 feet flat-top fed with 17 feet of 450 Ohm matching section ending in an SO-239 coax connector.

This antenna generally requires the use of a suitable matching network (antenna tuner) since the SWR of the G5RV JR. is almost certainly not 1:1 on any band. The use of a tuner will guarantee maximum performance from solid-state exciters.

The MFJ-1778M 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 such as the MFJ-915 should be used with this antenna to eliminate or reduce the undesirable parallel feed line currents. Failure to use a choke balun may result in RFI, RF feedback, or other symptoms of RF in the shack.

Brand: MFJ
Manufacturer's Part Number: MFJ-1778M
Part Type: Wire Antennas
Product Line: MFJ 1778M G5RV Jr. Wire Antennas
GigaParts Number: ZMF-1778M
UPC: 650619005028
Assembled Wire Antenna: Yes
Wire Antenna Type: Multi-band, non-resonant
Antenna Power Rating: 1,500 W
Wire Antenna Length: 52.00 ft.
Antenna Tuner Required: Yes
Feedline Connection Type: UHF female, SO-239


Wire Antenna Band Wire Antenna Frequency
40 meters 7.0 MHz
30 meters 10.0 MHz
20 meters 14.0 MHz
17 meters 18.0 MHz
15 meters 21.0 MHz
12 meters 24.9 MHz
10 meters 28.0 MHz
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