20' DX Flagpole Antenna — 160-6M, No Radials

HOA Stealth Flagpole Antenna · 160-6M · No Radials · Made in USA

The DXF20 — The Most Popular. For Good Reason.

The DXF20 is the Greyline system most operators choose — full 160-6M coverage from one feedpoint, no radials, no ground system. Twenty feet of aperture covers every band and performs genuinely well across the spectrum. Go as tall as your site allows and you pick up bonus dB on the low bands — the founder runs 32 feet himself — but the DXF20 is the height that fits most residential lots cleanly, and it does serious work on every band. A decade of HOA installations, commercial-grade construction, and HOA documentation included.

Not sure this is the right height for your lot? Call us at 435-200-4902 and we will spec your system in ten minutes — your lot, your HOA, your bands, your power. A real person answers, and we would rather talk you into the right antenna than the expensive one.

Why a Flagpole Antenna?

Most HOA CC&Rs explicitly permit residential flagpoles. The DXF's RF function is entirely internal — no visible stubs, no loading coils, no radial wires. From the street, it is a flagpole. A handsome one. The antenna approval is already in the CC&Rs — it is called a flagpole permit.

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

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

"I installed the 20-foot flagpole, worked through the connector setup, and it worked on all bands. In one week I had 241 reports across 29 countries — Europe, Africa, and South America — on just 60 watts, FT8 and CW."

— Andy, WJ8B

The Physics

Why No Radials — and Why It Works

Traditional quarter-wave verticals feed at the current maximum at the base — pushing maximum resistive 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. It works every band, 160-6M, from a single feedpoint with no radials — that is the headline. Return current flows through the lower element, not through a buried radial field, significantly reducing ground coupling and removing dependency on soil conductivity. On top of full coverage, the geometry peaks toward 5/8-wave on 10 meters for strong low-angle DX radiation — a bonus on the upper bands, not the whole story.

The physics behind the no-radial vertical dipole is established, published work — the full reference shelf is cited below, and a deeper VDA explainer lives in the Signal Lab for further study.

The Gain Figures, With Their Reference

Modeled gain figures and their references are stated on one sourced page so the numbers stay consistent everywhere. Aperture and Gain — the modeled figures

Before You Install — Run a Noise Audit

The VDA's 2-inch pole footprint is a very small ground signature for full HF coverage. 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 is where the pole goes.

In the Box

Everything You Need. Nothing You Don't.

You supply two things: coax for the run to your shack, and an external antenna tuner. Both are covered below, and both save you money in the same cart.

Structural Engineering

Built for Real Weather

Every DXF is engineered to ASCE 7-10 structural standards. The flag is the dominant wind load, which is why the two columns differ. Federal practice is to lower the flag when weather threatens, so the flag-down figure is the engineering number.

Ratings per ASCE 7-10. Lower flag during approaching weather per US federal flag protocol. Flag-down figures match the bare DXV vertical of the same height, because with the flag stowed that is what the pole is.

Take It Further

Complete The Station

All three of these come off automatically when they ride in the same cart as the antenna. No codes.

No flag needed? The DXV20 delivers identical VDA performance without flagpole hardware, and holds the 90 MPH rating with nothing to lower.

160-6M, One Pole

The 20' DXF is the system most operators choose — 160 meters through 6 meters with no radials, scaled to fit a typical residential lot. Adding the 9' DX Whip extends the upper radiator on every band; the geometry peaks at 5/8-wave on 10M bare or 15M with the whip. Every band benefits from the added length up to that geometric ceiling. Modeled gain figures for this height are stated on the aperture page with their reference and band.

Aperture and Gain — the physics, cited

HOA and XYL Approved

We've Done the Hard Part for You

Every DXF ships with an HOA Architectural Brief and Property Integrity Letter. A decade of field experience, and a simple design truth: the HOA sees a flagpole, because that is what it is.

Feed System Note

The DXF is a balanced VDA — tuner and RF choke must maintain a floating balanced feed. See the Tuner and Balun Configuration Guide, and the Feedline System Kits page for the full run from feedpoint to shack.

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, stainless hardware throughout.

At 20 feet, the Greyline VDA presents 3.33 square feet of wind surface. A flagpole antenna at this height using a significantly larger outer diameter presents 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 outer diameter matters, and why it is worth asking for the number.

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 antenna maker which standard they used. If they cannot cite one, you have your answer.

Specs and Shipping

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.

The full shelf lives under The Signal Lab · The Shelf We Read From in the menu, open to everyone.

Ready?

The DXF20 Ships Free in the USA and Canada.

Scroll up and add it to your cart — or call and talk it through with us first. We enjoy talking radio, and we would rather you order the right height than the nearest one.

435-200-4902

More aperture: The Skyline Series · Tighter lot or higher wind: the shorter DX Flagpoles

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