Uploaded December 2025 | Updated September 2026, 3 weeks ago
After seven weeks on the editing floor, the final chapter of the Holly Farm 40m 4-Square is here. Four verticals, four phasing lines, a control box, and a huge amount of head-scratching finally lead to the moment the array locks in - proper directionality, proper front-to-back, and that beautiful silence off the back.
In this video I walk through:
- Why four-squares only work when X = 0 on every element
- The real trick: ignore SWR, chase reactance
- How to tune phasing lines to the same Z-minimum
- Why my central mast should have ruined everything… and why it didn’t
- The software mistake that killed the front-to-back
- The moment the relays finally go clickity-click
- On-air tests showing the array suddenly behaving like a real four-square
- There’s plenty of B-roll, mistakes, dogs running around, and a few unexpected discoveries along the way.
But the result?
A rock-solid, directional 40m system with astonishing front-to-back.
If you're building or tuning a four-square, this will save you hours - and maybe your sanity.
Enjoy the journey,
Callum — M0MCX / DX Commander
After seven weeks on the editing floor, the final chapter of the Holly Farm 40m 4-Square is here. Four verticals, four phasing lines, a control box, and a huge amount of head-scratching finally lead to the moment the array locks in - proper directionality, proper front-to-back, and that beautiful silence off the back.
In this video I walk through:
- Why four-squares only work when X = 0 on every element
- The real trick: ignore SWR, chase reactance
- How to tune phasing lines to the same Z-minimum
- Why my central mast should have ruined everything… and why it didn’t
- The software mistake that killed the front-to-back
- The moment the relays finally go clickity-click
- On-air tests showing the array suddenly behaving like a real four-square
- There’s plenty of B-roll, mistakes, dogs running around, and a few unexpected discoveries along the way.
But the result?
A rock-solid, directional 40m system with astonishing front-to-back.
If you're building or tuning a four-square, this will save you hours - and maybe your sanity.
Enjoy the journey,
Callum — M0MCX / DX Commander
