Artisan HF Antennas Made in Idaho | Greyline Performance

About Greyline Performance

Artisan-Built HF Antennas. Sun Valley, Idaho.

Greyline Performance is an artisan manufacturer of HF vertical dipole antennas, hand-built one at a time in Sun Valley, Idaho. The antennas go to amateur radio operators, EmComm groups, and agency communications programs that need real performance from real-world installations — HOA lots, rooftop sites, waterfront properties, government facilities. The work is small-batch. The physics is published. The buyer is an operator.

What We Make

Five Heights. Two Product Lines. One Architecture.

Every Greyline antenna is an off-center fed vertical dipole. Elevated feedpoint, working as a self-contained circuit rather than against a buried radial system. Five core heights — 12, 16, 20, 24, and 28 feet. Two product lines: the DXF series styled as a residential flagpole for HOA installations, the DXV series as a bare vertical for rooftop, open-yard, and commercial sites. All five heights cover 160 meters through 6 meters from a single feedpoint with an external tuner.

Construction is 6061-T6 aircraft-grade aluminum, 2-inch outer diameter, with graduated wall thickness — thicker at the base where bending stress peaks, thinner toward the top where reducing mass at height reduces dynamic wind loads. Stainless steel hardware throughout. Every wind rating is calculated against the ASCE 7-10 engineering standard and is height-specific: the 12-foot model carries the highest rating, the 28-foot the lowest. The numbers are published on each product page.

The Artisan Standard

Greyline antennas are not pulled from a factory line. Each one is assembled by hand in a small machine shop, by people who have built thousands of them. Tolerances are checked against spec. The feed system is tested before the antenna ships. The shipping container is built around the antenna, not the other way around.

This is the trade-off the buyer makes: longer lead times during peak season, no flash sales, no race-to-the-bottom pricing. In return: an antenna that arrives properly built, performs as specified, and stands up under weather for the duration of the 7-year structural warranty — or longer. The oldest Greylines in the field are now over a decade old. They are still on the air.

We build what we would put up at our own QTH. Then we ship that.

The Operator Behind the Company

Jon, KL2A

Greyline's founder is Jon KL2A — Amateur Extra, CWops #77, five-time world contest champion. He has been operating CW and DX since the mid-1980s, from KL7, KH6, KA2, SV0, and his current Sun Valley, Idaho QTH. The contest record and DX log are independently verifiable on QRZ and in published contest databases.

Greyline started with a problem Jon faced at his own station. Burying 200 feet of radial wire was off the table. Putting up a tower was off the table. The choices were compromise the antenna or compromise the operating. Neither was acceptable.

The answer turned out to be the off-center fed vertical dipole. Elevated feedpoint. No radial field required. Multi-band coverage from 160 through 6 with an external tuner. Permanent, maintainable, and small enough that it disappears as an antenna and shows up as a flagpole. The first builds went to fellow operators. Word moved. The product line followed.

Why We Cite Our Sources

The Shelf We Read From

Antenna marketing is full of unsupported claims. Greyline's standing rule is simple: if a claim cannot be traced to a named published source, it does not run. The physics references behind every Greyline design decision are public — Robert Zavrel W7SX ( Antenna Physics: An Introduction , ARRL 2020), John Kraus W8JK ( Antennas , McGraw-Hill), Rudy Severns N6LF for ground systems, Walter Maxwell W2DU for transmission lines, Roy Lewallen W7EL for the NEC modeling tools behind every gain figure we publish.

The full bibliography — physics, propagation, low-band, modeling, HOA zoning — lives at The Shelf We Read From . Every page on this site is built to stand up to those references.

Greyline RF Toolbox · Free for Ops

Tools an Operator Can Use Today

An artisan shows the tools alongside the work. Greyline's RF Toolbox is a growing set of free calculators built for operators — no login, no paywall, no email capture. The Feedline Loss Calculator shows you how much of your power actually reaches the antenna across coax types, lengths, and bands. The VDA Optimizer lets you configure any Greyline height-and-whip combination and see modeled gain on every band, the wind rating, and where the 5/8-wave sweet spot lands. Built by hams. For hams. Pass them on.

Who Buys Greyline

The Operator Mix

The buyers are operators. DX hunters chasing band-fills. Contesters putting up the antenna they can keep up year-round. EmComm volunteers who need an HF antenna that survives the same weather event it has to communicate through. Returning hams coming back to the bands after long absences. New licensees putting up their first HF antenna. Operators behind HOA lines who were told they could not have HF at all.

The product is also deployed in government, agency, and commercial communications programs — embassies, defense contractors, state emergency operations centers, port and maritime sites — where a low-profile, low-maintenance HF antenna with published engineering matters more than the price tag. Agency inquiries are handled through a dedicated Agency Solutions channel .

Operators return regularly with on-air results — DXCC counts, contest scores, band-by-band reports. A selection of named-callsign operator stories is documented in our Signal Report series, and the verifiable contest and DX records of those operators can be checked independently on QRZ, in published contest databases, and on PSK Reporter.

The Company

Sun Valley, Idaho. Made in America.

Greyline operates from Sun Valley, Idaho — Mountain Time, 7,000 feet of elevation, and a view of the Sawtooth Range out the shop window. Aluminum tubing is sourced through American mills. Assembly happens in a small machine shop run by a structural engineer who has been building Greylines for years. Every antenna is built to spec, tested, and either shipped from inventory or scheduled into the next production run. Current lead time is always posted on the Order Status page .

Free shipping within the USA. International shipping available; rates vary by destination. Seven-year structural warranty on every antenna.

How to reach us

Phone: 435-200-4902 (Sun Valley, Idaho — Mountain Time). Best for technical questions, site-specific recommendations, lead time, and shipping discussions. Jon answers the phone.

Web: Contact form for written questions and order inquiries.

Ham Radio is fun again. Pass it on. 73, Jon KL2A & the Greyline Performance Team — greylineperformance.com — 435-200-4902