Gov & Agency HF Antennas — No Radials | Greyline Performance

Name: Greyline DX Series VDA Antenna Systems
Brand: Greyline Performance
Availability: InStock

Agency & Government

HF Antenna Infrastructure for Government, Research & Emergency Operations

Greyline VDA systems are in active service with government and diplomatic facilities, research institutions, state emergency operations centers, and defense contractors. 1.5–54 MHz from a single feedpoint. No radials — deployable on rooftop, concrete, asphalt, or frozen soil. ALE and digital-mode ready. Built by hand in the USA; based in Sun Valley, Idaho.

On customer identification: we do not name agencies, institutions, or installations. Not in marketing, not in case studies, not on request. Operators who require a discrete profile in the field deserve the same discretion from their vendor.

Engage for Pricing

Pricing is available by direct engagement. We respond to RFIs and RFQs directly. Custom configurations and volume specifications on request.

435-200-4902 Contact Form

Procurement Documentation

Section 889 compliance, FAR 52.204-24, NAICS codes, component origin documentation, and past performance — formatted for procurement review.

Capabilities Statement Procurement Justification Brief EmComm Technical Brief

Is This You?

Who We Work With

Federal & Diplomatic

Government and diplomatic facilities, federal EOCs, and installations requiring permanent or deployable HF infrastructure with a low visual profile. Custom configurations available.

Defense & Contractors

Defense contractors, integrators, and program offices requiring COTS HF antenna systems. Section 889 compliant; antennas built by hand in the USA.

Research Institutions

Universities, field stations, and research programs running HF where there is no infrastructure to build on. The no-radial design deploys on rock, permafrost, sand, or a rooftop — sites where a conventional ground system is not merely difficult but impossible.

Emergency Management

State and county EOCs, municipal emergency managers, and EmComm infrastructure programs requiring reliable HF without a radial field to install or maintain.

Peer Validation — 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."

— Rob Freedman, WC0R · Retired Defense Antenna Executive · Amateur Extra · Full case study

System Capabilities

Technical Specifications

Frequency Coverage

1.5–54 MHz from a single feedpoint — the full government HF range and every amateur band 160–6M — with an antenna tuner rated for the range. No switching, no band-specific antennas.

Power Handling

Full legal limit at 100% duty cycle at the radiator. No traps or coils to fail under sustained digital or ALE operation. System power is constrained by the selected ATU rating.

Deployment Surface

Rooftop, concrete, asphalt, frozen soil, rocky terrain. No radial field required. Performance far less dependent on ground conductivity than a ground-fed vertical.

Construction

2-inch 6061-T6 aluminum, fiberglass insulators, stainless hardware throughout, with 316 marine-grade kits for coastal sites. ASCE 7-10 engineered. 7-year structural warranty. Built by hand in the USA.

Wind Load Rating

ASCE 7-10 engineered and published per height, flag up and flag down: 12' 100/155, 16' 75/115, 20' 60/90, 24' 50/70, 28' 35/55 MPH.

Modes

Waveform-agnostic broadband radiator: ALE, STANAG 4538, JS-001, MIL-STD-188-141B, FT8, JS8Call, Winlink, VARA, voice, CW.

Low Visual Profile

The DXF flagpole configuration presents as a standard commercial-grade institutional flagpole. The pole itself is the antenna, so there is nothing added to see — no stubs, loading coils, or radial wires. Appropriate for installations where a low visual profile is operationally or aesthetically required. Flies a full-size flag.

Procurement

Credentials

Section 889 Compliant

No covered telecommunications equipment

FAR 52.204-24

Compliant. Documentation on request

Origin

Antennas built by hand in the USA; component origin documentation on engagement

A dedicated procurement channel for government, research, and agency buyers — with custom configurations, volume specifications, and no public pricing — is in development. Contact us directly to discuss current requirements or to be notified when it launches: 435-200-4902

Reference Documents

Capabilities Statement
Procurement Justification Brief
EmComm and EOC Technical Brief
HF SCADA & Telemetry
Commercial-Grade Construction Guide
VDA Physics, No-Radial Operation
Documents & Forms
Contact Greyline

Jon Kimball, KL2A · Founder, Greyline Performance · 435-200-4902

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Worth every penny!

I added this tilt mount on my older (2.25") 28' flagpole and I couldn't be more pleased with how well it works for me. I can now drop down or raise my flagpole by myself in about 5 minutes in each direction. This mount is an engineering beast with how well it is constructed! Previously I had to wait and get another person to help lift the base out of the PVC pipe and help lower it hoping that it came down as planned. Going up was even more of a challenge getting the base into the hole and raising it back up. That's 33 feet of wiggling aluminum and not so easy to manage even with two people. With this mount I don't even give it a second thought about doing maintenance or lowering it for an impending storm. It's straight coming down and going back up with no overshoot. Or worries. This is an excellent investment in both time and money!

Gary, coming from someone who's flown one of our early 28-footers for years, that means a lot. Thanks for the upgrade and the kind words. — Jon KL2A

Aperture makes a difference

I find that the added 4 feet makes a difference, along with the 9' whip and tilt base. Signals are stronger on receive, and my transmit reach appears to have extended based on signal reports. Still adding many DX contacts to the log! Looking forward to getting the aluminum cap for the 2" to whip transition. I believe that will help as well.

Christopher, the extension, the whip, and the tilt together are the full aperture system, and your log shows it. Thanks for taking the time to write this up. — Jon KL2A

Size Does Matter!

I was already happy with my DXF24 flagpole, but adding the 4' extension made a great thing even better! My setup is the 28' flagpole with the tilt-over base, 1:1 balun at the base with 40' LMR400 to my KAT500 tuner in the shack.

My first week after adding the 4 foot extension (a super easy job with the tilt-over!), I logged RI1FJL on 15m and P29YY on 17m, and discovered I could now make QSOs on 80 meters. I hadn't made a QSO on 80 meters I moved into this HOA community 21 years ago!

If I had room for the 9' whip on top, I would add that next and probably gain 160 meters. But this current flagpole setup is giving me 80 thru 6 and tons of QSOs, all with convenient band switching from my shack. Yes, it's fun again!

Tom, 80 meters for the first time in 21 years, from an HOA lot — that's the whole case for aperture in one line. RI1FJL and P29YY in the first week didn't hurt either. Thanks for the report, and see you on 80. — Jon KL2A

Doesn't get any easier

I've had my 24ft flag pole for about a year and each time I wanted to do any maintenance it required another person and even then as we get older it's a task and a half. The installation of the tilt up base was to easy. As described by others, loosen the three bolts, remove the second one and up or down is a cake walk. I always had a little wobble at the ground when the wind blows so I fashioned a shim from some aluminum flashing, shaped like a shoe horn and now it remains straight up in the wind. I have some experiments planed which I will now be able to do without help from another person.

Bart, no second person, no ladder, maintenance on your own schedule — that's exactly why the tilt exists. Thanks for the shim tip too; it's gone to our shop. Enjoy the experiments. — Jon KL2A

Game Changer

It’s not the weight of the antenna - it’s the fulcrum. Before the tilt up base it was a two person job. Now it’s a very simple operation to raise and lower the antenna. Great addition, especially in Eastern North Carolina where severe weather is abundant.

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Gov & Agency HF Antennas — No Radials | Greyline Performance

HF Antenna Infrastructure for Government, Research & Emergency Operations

Who We Work With

Technical Specifications

Credentials

Let customers speak for us