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

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

The DXF28 — The Flagship. Maximum Aperture. No Compromises.

The DXF28 is Greyline's most capable flagpole antenna — the choice for operators who demand every dB the design can deliver. At 28 feet, the VDA achieves full 5/8λ geometry on 15 meters, delivering up to 3.5 dBi of gain potential on that band. The pattern angle rises slightly on 12 and 10 meters, but real-world DX performance on those bands remains strong — going taller is worth it when height clearance allows. A property asset that raises curb appeal, flies a full-size flag, and satisfies any HOA board.

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's a flagpole. A handsome one. The antenna approval is already in the CC&Rs — it's called a flagpole permit.

⚑ Flag-Down Protocol

At 28 feet, the flag-up wind rating is 55 MPH — follow federal flag practice and lower the flag when weather threatens. The 65 MPH flag-down rating is your ASCE 7-10 engineered structural number. Standard protocol for all commercial flagpole installations at this height.

Field Report — Virginia

Independent review, published before purchase. First night: G4 on 160M, LZ on 80M, TZ4 on 20M, KP4, 9K, KH6, CE, and Europeans on 40M. Next morning: 31 QSOs in 15 minutes on 40M CW. MFJ shack tuner. Drake L7 amp. “It does work.”

— Rich · NN3W · 28' DXV (same VDA core) · Verified Owner

Independent Assessment — Defense Antenna Executive

“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 in Colorado. Concrete foundation. FT8 DX confirmed to Hawaii, South America, Europe, and Africa.

— Rob Freedman · WC0R · Retired Defense Antenna Executive · Amateur Extra · Colorado HOA

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 full 5/8λ geometry on 15 meters — up to 3.5 dBi gain potential on that band (modeled). Strong low-angle radiation on 20M and above. Best low-band aperture in the DXF lineup.

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.

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.

In the Box

Everything You Need. Nothing You Don't.

Structural Engineering

Built for Real Weather

Every DXF is engineered to ASCE 7-10 structural standards. Federal practice: lower the flag when weather threatens. The flag-down rating is your engineering number.

Ratings per ASCE 7-10. Lower flag during approaching weather per US federal flag protocol.

Take It Further

Upgrades That Actually Move the Needle

160–6M, One Pole

The 28' DXF is the flagship of the line — maximum aperture, 160 meters through 6 meters, no radials . The longest electromagnetic capture area Greyline ships in a residential VDA. ASCE 7-10 wind-rated to 65 MPH flag-down. Adding the 9' DX Whip extends the upper radiator on every band; the geometry reaches into the 17M and 20M region, hitting 5/8λ resonance where the literature documents up to 3.5 dBi over a 1/4-wave reference under ideal ground conditions.

Aperture & Gain — the honest physics →

HOA & XYL Approved

We've Done the Hard Part for You

Every DXF ships with an HOA Architectural Brief and Property Integrity Letter. Field-proven across more than a decade of installations. Zero HOA complaints on record. Engineered to ASCE 7-10 standards from the ground up.

Feed System Note

The DXF is a balanced VDA — tuner and RF choke must maintain a floating balanced feed. See the Tuner & Balun Configuration Guide →

Specs & Shipping

“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

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. Sheltered installation recommended at this height.

At 28 feet, the Greyline VDA presents 4.67 square feet of wind surface. At this height the moment arm is at its longest — every additional square foot of projected area translates directly into greater base bending stress and greater dynamic fatigue loading on every gust cycle. The graduated wall construction is not a cost-saving measure. It is the correct engineering response: maximum material where bending stress peaks, minimum mass where it only adds dynamic load.

A 4" OD pole at 28 feet would present roughly 9.3 square feet of wind surface — substantially more load at the height where load matters most. The outer diameter is the variable that reveals everything. The slim 2-inch section sheds wind a fat one fights.

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 can't cite one, you have your answer.

Limited Edition · Artisan Production Run

The flagship. Built by hand — one at a time — by someone who knows every inch of it.

Same 6061-T6 aircraft aluminum. Same ASCE 7-10 wind ratings. Same VDA geometry. Same 7-year guarantee. Threaded transition sections machined directly into the metal — self-aligning, no through-bolting, less total weight. The joint is cleaner than what came before it.

The 28' is the best antenna Greyline has ever shipped. This production window closes when manufacturing expansion completes. 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.

The full shelf — Zavrel, Kraus, Severns, Maxwell, Lewallen — lives under The Signal Lab · The Shelf We Read From in the menu, open to everyone.

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