Heavy-Duty · 3-Inch Base · 160-6M · No Radials · Made in USA
The 28' HD: The Greyline Built for Wind.
The same Greyline design, every band 160 through 6 from a single feedpoint with no radials, built on a heavy-duty 3-inch base. For exposed sites, northern winters, open ground, and operators who want the full 28 feet with real margin under it.
Now Taking Orders — Ships in 1-2 Weeks
The first 28' HD goes to Iceland, to face the winter winds. Anyone watching the weather channel?
The next builds are right behind it, ready to go. Order now and yours ships in one to two weeks, free to the USA and Canada. Rated well above the standard 28'; the certified ASCE 7-10 numbers are published here with the final engineering.
Want it to fly a flag? The HD also comes as a real flagpole, flag kit included: 28' HD DX Flagpole →
Want it taller? The HD finishes in the same top sections as every Greyline, so the 9' DX Whip seats right on it: 37 feet of HF vertical on a heavy-duty base, the tallest Greyline we build, with the whip's added length paying most on 40, 80 and 160. The wind rating with the whip is published with the certified numbers.
Why a 3-Inch Base
A wind rating comes from the whole pole, not the diameter alone. A fatter pole catches more wind, so it only wins when the structure is engineered for it. The HD is: a heavy-duty 3-inch base where the bending load lives, every joint bolted in stainless, engineered to ASCE 7-10. For reference, the standard 2-inch 28-footer is rated 55 MPH, and the HD is rated well above it.
Which 28-Footer? Same Antenna, Two Builds
| 28' (2-inch) | 28' HD (3-inch base) | |
| Signal | Identical: every band 160-6M, same feedpoint, same performance | |
| Wind (ASCE 7-10) | 55 MPH (DX Flagpole: 35 with the flag flying) | Well above the standard 28'; certified numbers published with the final engineering |
| With the 9' whip | Skyline 37 | 37 feet on a heavy-duty base |
| Built for | Most yards and HOA lots; tilt it down ahead of a big storm | Open ground, ridgelines, coastline, high plains, northern winters: sites where wind is the design problem |
| Price | $1,250 DX Vertical · $1,295 DX Flagpole | $2,195 DX Vertical · $2,240 DX Flagpole |
| Ships | Within days | In 1-2 weeks |
| Tilt | Tilt-Up Base | 3" HD Tilt-Up Base |
Not sure which your site needs? Call 435-200-4902 and tell us about it. See the standard 28' →
Why No Radials, and Why It Works
A traditional quarter-wave vertical feeds at its base, so every ohm of ground resistance sits in series with the antenna and steals signal before it leaves your yard. The Greyline VDA is a vertical dipole: return current flows through the lower element, not a buried radial field, so the antenna stops depending on your soil. Frozen ground, rock and sand included. One feedpoint, every band.
Pair It With the 3" HD Tilt-Up Base
A heavier pole deserves its own tilt. The 3" HD Tilt-Up Base is built alongside the antenna, with the same one-direction pivot that stops dead at vertical, so the HD comes down for maintenance or ahead of a storm. It ships in the same window, and it's $25 off with the HD in the cart.
Watch: 14 Seconds
One person raises a 24' Greyline alone on the standard Tilt-Up Base. The HD tilt uses the same pivot, scaled for the heavier pole. Watch the 14-second raise →
Specs
| Height | 28 feet; 37 feet with the 9' DX Whip |
| Pole | Heavy-duty 3" base, 6061-T6 aluminum, stainless hardware |
| Bands | Every band, 160-6M |
| Design | VDA, Vertical Dipole Antenna, off-center fed |
| Radials | None |
| Wind | ASCE 7-10, rated well above the standard 28'; certified numbers, with and without the whip, published with the final engineering |
| Foundation | About 12 cubic feet of 3,000 psi concrete over gravel, set plumb; PE-designed foundation for exposed or critical sites; drawing included with your order |
| Weight | Published with the certified wind rating |
| Ships | In 1-2 weeks; free to the USA and Canada; worldwide at carrier cost |
| Home | Designed and built in the Mountain West · KL2A and HQ in Sun Valley, Idaho |
| Warranty | 7 years. We improve the design whenever we learn a better way; this page is the current reference. |
Photo: a standard Greyline 28-footer. HD build photos from the bench are coming.
Ham Radio is fun again! Pass it on… 73, Jon KL2A · Greyline Performance · 435-200-4902