28' HF Vertical Antenna | Flagship | 5/8-Wave 15M | No Radials | Greyline Performance

HF Vertical Antenna · 160–6M · No Radials · Made in USA

The DXV28 — Flagship Vertical. Maximum Aperture.

The DXV28 is Greyline’s most capable vertical — the system specified for EOC global ALE continuity, embassy compounds, and serious DX operators who want every dB the design can deliver. At 28 feet the VDA achieves full 5/8λ geometry on 15 meters. 100% duty cycle. Deploys on any surface. No radials. No buried ground system required.

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.

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 · Verified Owner · Full operator report →

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 · Full case study →

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. Best low-band aperture in the DXV lineup.

Physics foundation: Zavrel W7SX · Antenna Physics: An Introduction (ARRL, 2020) · Kraus W8JK · Antennas (McGraw-Hill) · Deep dive: 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.

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

In the Box

Everything You Need. Nothing You Don’t.

Structural Engineering

Built for Real Weather

Every DXV carries a single wind rating — no flag load variable. ASCE 7-10 engineered throughout.

Ratings per ASCE 7-10.

Take It Further

Upgrades That Actually Move the Needle

Feed System Note

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

Specs & Shipping

DXV or DXF? The DXF28 adds flagpole hardware, flag kit, and HOA documents. Choose DXV for permanent EOC install, rooftop, or any site where the flagpole isn't needed.

“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.

Competitors operating at larger outer diameters at comparable heights face exponentially compounding wind load numbers — and most cite no engineering standard for their ratings. A 4" OD pole at 28 feet would present roughly 9.3 square feet of wind surface. Twice the load at the height where load matters most. The outer diameter is the variable that reveals everything. If a manufacturer won't publish it, ask why.

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.

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 window closes when manufacturing expansion completes. Watch this space.

Common Questions

Before You Order — Answered.

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