MyAntennas EFHW-4010
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| Frequency | 40, 20, 15 and 10 m (resonant; WARC bands usable at ~100 W with a tuner) |
| Bands | 40m, 20m, 15m, 10m |
| Power | Available in 200 W (EFHW-4010P), 1 kW (EFHW-4010-1K) and 1500 W (EFHW-4010-HP) versions. A passive antenna - no power is consumed; no tuner needed on the four main bands. |
| Modes | n/a (multiband end-fed half-wave wire antenna) |
| feedpoint | SO-239 at the 49:1 matching transformer (one end of the wire) |
| power req | Passive end-fed half-wave. High-impedance end feed via a 49:1 transformer; needs only a short counterpoise, not a radial field, and is relatively height-insensitive. No tuner needed on 40/20/15/10 m. |
A superbly practical multiband wire: one ~63-foot wire and one feedline cover 40/20/15/10 m with no tuner, it needs only a short counterpoise rather than a radial field, and it is forgiving of mounting height. The high-power versions handle the legal limit, and the end-fed geometry makes it easy to hang as a sloper or inverted-L from a single support.
It is a half-size-of-80 m wire (about 63 feet) that still needs a clear run and a far-end support, the WARC bands require a tuner, and a good feedline choke is important to control common-mode current. It is a wire antenna, so it is a compromise versus full-size resonant antennas on each band.
The MyAntennas EFHW-4010 is a benchmark no-tuner multiband end-fed half-wave for 40/20/15/10 m - easy to deploy, height-tolerant and available up to 1.5 kW. It is a great all-round wire; the EFHW-8010 adds 80 m at greater length.
The MyAntennas EFHW-4010 is a multiband end-fed half-wave (EFHW) antenna covering 40, 20, 15 and 10 meters with no antenna tuner required. It is a single wire about 63 feet long - a half-wave on 40 meters - and because a half-wave on the fundamental is also resonant on its harmonics, the same wire works on 20, 15 and 10 meters too.
The trick that makes it practical is a 49:1 matching transformer at the feed end, which transforms the very high impedance at the end of a half-wave wire down to the 50 ohms your coax and radio expect. That end-feed approach has real advantages: it needs only a short counterpoise rather than a full radial field, it is relatively insensitive to mounting height (working much the same at 10 or 50 feet), and it can be hung from a single support as a sloper, inverted-L or flat-top. It comes in 200-watt, 1-kilowatt and 1500-watt versions, so there is a model for QRP through legal-limit use.
The trade-offs are those of any wire: it still needs a clear ~63-foot run and a far-end support, the WARC bands need a tuner (and run best at lower power), and a good feedline choke is important to keep common-mode current off the coax. As an easy, no-tuner, deploy-anywhere multiband wire, though, it is a benchmark.
It is the 40-10 m sibling of the longer MyAntennas EFHW-8010 (which adds 80 m), and a fixed-station alternative to portable end-feds like the PAR EndFedz.