Designed & built in the UK

Award-winning Yagi & LFA antennas, engineered to win.

Home of the original LFA (Loop-Fed Array) Yagi. Contest, EME and DX-grade antennas modelled to perfection and trusted by serious operators worldwide.

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TX · Site Notice

A fresh start for G0KSC.

Our previous website ran on an ageing platform that had reached the end of its safe life. Rather than patch over the cracks, we’ve taken it offline and are rebuilding G0KSC on a modern, secure foundation.

The business is fully operational and that work is underway right now. Antennas, design files and tools are all on their way to this new home.

Browse Antennas Email G0KSC

LFA Yagi

The clean, low-noise loop-fed design

Ansys HFSS

Every design simulated & verified

HF → SHF

From 50MHz to microwave dish feeds

Worldwide

Shipped to operators on every continent

The Range

Antennas for every band and every operator.

See all in the shop

From bench to backyard

Three ways to put a G0KSC design on your mast.

This site lists a selection of Justin’s early work — free to build for personal, non-commercial use. The latest and most refined designs are available as premium self-build files here in the G0KSC shop, and as fully-built commercial antennas through InnovAntennas.

Free to build

Early & Legacy Designs

A selection of Justin’s earlier antennas, free to build for personal, non-commercial use.

Browse free designs →

G0KSC Shop

Premium Self-Build Files

The latest, fully-refined designs as detailed self-build files, drawings and cut lists.

Visit the shop →

InnovAntennas

Commercial Antennas

Prefer it ready to bolt on? The current range ships fully assembled from InnovAntennas.com.

Go to InnovAntennas →

LFA Yagis

OWA Yagis

Contest & EME

Engineered, not estimated

Where amateur radio meets professional RF engineering.

G0KSC designs are developed and validated in Ansys HFSS — the same electromagnetic simulation suite used by aerospace and defence. The result is real-world performance you can predict before the antenna ever leaves the bench.

Modelled in Ansys HFSS

Full-wave electromagnetic simulation, not approximation.

Direct 50Ω feed

No lossy matching networks or gamma matches required.

Low-noise patterns

Clean front-to-back and suppressed sidelobes for quiet receive.

Built to last

Marine-grade hardware and robust mechanical engineering.

Featured

Popular right now

6m 7-Element LFA Yagi

£479.00 View

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2m 10-Element LFA Yagi

£299.00 View

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70cm

70cm 18-Element OWL

£199.00 View

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20m 4-Element OP-DES Yagi

£699.00 View

Justin

G0KSC

The Person Behind the Range

A lifelong amateur on a mission for cleaner, quieter antennas.

Justin Johnson, G0KSC, pioneered the Loop-Fed Array Yagi to deliver low-noise, direct 50-ohm feed performance without the losses of traditional matching systems. What began as home-brew experimentation became a respected range used by contest stations, EME enthusiasts and DXers around the world.

Every design is shared openly through tutorials, articles and YouTube videos — because better antennas are built on knowledge, not secrets.

Read the articles

Learn & Build