The M0XXT Mega-Loop antenna - VHF gain for the HF bands
Many people ask me what our HF antenna is. It’s just a delta loop antenna (triangle) made from 2mm wire at about 58m per leg (174m perimeter) with a height above ground of around 60 to 80 feet (depending on tension) fed with coax to a 4:1 balun at the feedpoint in one corner. It is horizontal and strung between three large oak trees. The main RF gain is opposite the feedpoint. We achieve less than 2:1 across most of the ham bands. It even works for WARC bands too.
Over the last two years, we have had huge success with this antenna which tunes from 160m band right up to 6m (we’ve even used it on 2m and 70cms!). Originally, this design was for 80m perimeter but we extended it to twice the size on a whim and it worked even better. The plots that follow are now inaccurate. These are extremely conservative. Doubling the size makes the 20m plot look more like the 10m plot now.Go check the last picture below. It says 10m band but this is what we’re actually achieving on 20m. Isn’t that amazing? 10m is off the scale with less than 5% take-off angles.
I have held a pile up from Birmingham (UK) to West Coast of USA on 10w. Receiving 57 reports at that power. Running 400w delivers consistend 20dB over S9 reports in early eve, winter time.
