20' DX Flagpole Antenna + ATU | No Radials | Greyline Performance

HOA Flagpole Antenna + Remote ATU Bundle · 160–6M · No Radials · Made in USA

The DXF20 Bundle — Complete System. On the Air Fast.

The DXF20 is the Greyline system most operators choose — the scale most people picture when they think residential flagpole, with the aperture to deliver strong performance on 40 and 80 meters. A decade of HOA installations. A property asset in every sense: commercial-grade construction, curb appeal that replaces the bird’s-nest wire problem, and HOA documentation included. Paired with the LDG RT-100 remote ATU at the antenna base. You supply coax. That’s it.

From the Founder

“I run a 32-foot at home and work Africa and Asia regularly on 10 through 30 meters. Real gain across every one of those bands — from +1 dBi on 30M up to +3.5 dBi on 17M. Go as tall as your lot allows — the multiband improvement is real.”

— Jon KL2A · Founder, Greyline Performance

What’s in the Box

The Complete System.

Field Report — Colorado HOA

“I ran a defense antenna company for 7 years. I am very impressed with the look, quality, machining, and part fit. It is a professional-grade product.” HOA approved. Concrete foundation. FT8 DX confirmed to Hawaii, South America, Europe, and Africa.

— Rob Freedman · WC0R · Retired Defense Antenna Executive · 20' DXF · Verified Owner · Full case study →

Field Report — HOA North Carolina

ARRL CW Sweepstakes: Clean Sweep — all 83 sections, 600+ QSOs from an HOA lot. WPX CW and ARRL DX CW: 1,000+ QSOs each. The tallest flagpole his HOA allows. “A Clean Sweep with my flagpole!”

— Bill · K3WA · PVRC President · 20' DXF · Verified Owner · Full contest report →

The Physics

Why No Radials — and Why It Works

Traditional quarter-wave verticals feed at the current maximum at the base — pushing maximum I²R loss directly through soil. Every ohm of ground resistance sits in series with your radiation resistance, stealing signal before it leaves your yard.

The Greyline VDA is a vertical dipole. Covers 160–6M from a single feedpoint with no radials. Return current flows through the lower element, not through a buried radial field — significantly reducing ground coupling and removing dependency on soil conductivity. Achieves 5/8λ geometry on 10 meters and 1/2λ on 12 meters — strong low-angle radiation favorable for DX propagation.

Physics foundation: Zavrel W7SX · Antenna Physics: An Introduction (ARRL, 2020) · Kraus W8JK · Antennas (McGraw-Hill) · What is a VDA? →

Before You Install — Run a Noise Audit

The VDA’s 2-inch pole footprint is the smallest ground signature of any full-HF-coverage antenna. A traditional radial field extends hundreds of feet at 160 meters — running toward every noise source on the property. The VDA goes where you choose. Grab a battery-powered AM radio, tune off any broadcast station, walk your property, and find the quietest spot. That’s where the pole goes.

HOA & XYL Approved

Every DXF Bundle Ships with the Approval Toolkit

Feed System Note

Balanced VDA — the LDG RT-100 is pre-configured for base-mount. See the Tuner & Balun Configuration Guide →

Specs & Shipping

Construction — 6061-T6 Aircraft Aluminum

Outside: 2" OD, full length — uniform profile top to bottom. Clean. Sleek. Invisible as an antenna. Inside: wall graduates where the physics demands it — 0.125" lower 30% where base bending stress peaks, 0.065" upper 70% where reducing mass at height lowers dynamic wind loads. Zero plastic. All-metal. McMaster-Carr hardware throughout.

At 20 feet, the Greyline VDA presents 3.33 square feet of wind surface. The nearest competing flagpole antenna at this height uses a significantly larger outer diameter — never published, inferred from their own base insulator dimensions — presenting roughly double the projected area. Wind force scales with projected area linearly and with velocity squared. At 20 feet, a wider pole also concentrates more mass at height, increasing dynamic fatigue stress on every oscillation cycle. This is why OD matters, and why the fact that competitors don't publish it is worth noting.

Every Greyline wind rating is derived from ASCE 7-10 structural engineering values — actual geometry, actual math, published methodology. A wind rating without a cited standard is a guess dressed as a spec. Ask any competitor which standard they used. If they can't cite one, you have your answer.

The antenna in this bundle ships from our current artisan production run — hand-built, individually fitted and finished, with threaded metal-to-metal section marriages. Same engineering, same guarantee, same performance. The LDG RT-100 ships as matched system. Full engineering reference →

Limited Edition  ·  Artisan Production Run

Hand-built antenna. Production-matched tuner. The complete system, built to last.

Same 6061-T6 aircraft aluminum. Same ASCE 7-10 wind ratings. Same 7-year guarantee. Threaded transition sections machined directly into the metal — self-aligning, no through-bolting, less total weight. Paired with the LDG RT-100 at the feedpoint where the tuner belongs.

Manufacturing expanding. Things coming this year. Watch this space.

Common Questions

Before You Order — Answered.

Every Greyline design decision traces back to named, published antenna physics — Zavrel W7SX, Kraus W8JK, Severns N6LF on ground systems, Maxwell W2DU on transmission lines, Lewallen W7EL on modeling. Not opinions. Cited works.

Read the full shelf →

Ham Radio is fun again! Pass it on... 73, The Greyline Performance Team · Sun Valley, Idaho · 435-200-4902