(1 customer review)


MEF-110-1K Multiband EFHW Antenna Transformer,  Covers1-10MHz/ 1kW-max. /  NO TUNER needed / wire not included/ one End Insulator included


SKU: MEF-110-1K Categories: ,


MEF-110-1K Multi-Band End Fed Half Wave Antenna Transformer

This is an End-Fed Half-Wave antenna (EFHW) transformer covering 160/80/40/30m amateur bands or any frequency in between. It transforms high impedance ~3000 Ohms at the end of half wave radiator to 50 Ohms and features very low insertion loss.

  • NO TUNER needed!
  • NO counterpoise needed! (Grounding recommended)
    • Just adding a wire radiator of ~132 feet makes this antenna resonant on 80/40m.
    • The wire of ~132 feet (40.23meters) will give you low VSWR on 80/40m.
  • Frequency coverage: 1-10MHz
  • Power Handling: 1kW I.C.A.S
  • Weight:  1lbs. (0.45kg)
  • Hardware: Stainless Steel
  • Connector: Silver/Teflon SO-239


Just add 1/2 half wave wire to this transformer and tune the length to your preference. Note that antenna will be working on multiple frequencies. Half wave for 80m (~132 feet) will be half wave on 80m and two (2) half wave on 40m band. If you desire to use it on  30m or new 60m band only, just cut the half wave length wire for that frequency or any frequency from 1-10MHz. Wire length can be calculated by following formulas:

  • Length (feet)= 468/Frequency (MHz) orlongwire1
  • Length (meters)=142.5/Frequency (MHz)

Always cut a wire a bit longer to allow for tuning to your desired frequency. Tuning depends on height above ground and nearby objects. There is so many ways to install the wire and your imagination is only limit. You can do it horizontal, vertical, sloping, in inverted “L” shape, in “inverted “V” shape, Zigzag, etc.

Such antenna will not need radials and in most cases NO Tuner at all. You can use it as vertical against good radial counterpoise too. Be a HAM and do some experiment.

Grounding at the lug next to the SO239 connector is recommended! Long wires tend to collect electrostatic charge (usually when the weather is stormy) which can produce ESD (electrostatic discharge) at the end of your cable and damage your equipment.


Insertion Loss measurements of MEF-110-1K transformer

NOTE: this plot shows an S21 measurement of two (2) transformers connected back to back and total insertion loss of single transformer is half of the measured values showed  the plot. 

Insertio Loss, two MEF-110 back to back
Insertion Loss, two MEF-110-1K back to back



1 review for MEF-110-1K

  1. Perrin

    I have been using this antenna on a commercial HF system here in Australia which has two licensed frequencies under 10Mhz which scan, (these are conveniently a harmonic of each other). On paper, this antenna looked to be the perfect solution for one of my base sites given its ease of installation, relitively small size and claimed performance with no tuner required.

    Well, I am happy to report that it works as well in practice as it does on paper! It has been in operation for over a year and has been performing brilliantly with no issues at all. Build quality is excellent too.

    I can’t recommend Myantennas products highly enough, for either ham radio, or commercial services.

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