HD Series · Heavy-Duty · 20 Feet · 160-6M · No Radials · Made in USA
The 20' HD: The Strongest Greyline We Build, and Built to Grow.
Every band 160 through 6 from a single feedpoint, no radials, on an oversized heavy-duty base. At 20 feet it keeps a low profile for strict height limits and stands up to the worst weather on the coast, the plains and the ridgelines.
Two Reasons People Choose HD
Wind today. About 124 mph (preliminary engineering estimate; PE-certified rating to follow), against 90 for the standard 20-foot vertical. The highest rating in the HD Series.
Height tomorrow. The heavy-duty base is a platform. When the limit lifts, add a section and it is a 24' HD, then a 28' HD; add the 9' whip at any height. Add below the feedpoint, 4 feet, 8 feet and more, and you raise the feedpoint and lift the image, the other half of a vertical's RF picture, with a longer ladder line to match. Buy the base once; grow the antenna for years. Ships in 1-2 weeks, free to the USA and Canada.
Which 20-Footer? Same Antenna, Two Builds
| 20' DX Vertical | 20' HD | |
| Signal | Identical: every band 160-6M, same feedpoint | |
| Wind | 90 mph (ASCE 7-10) | About 124 mph* |
| Price | $1,050 | $1,995 |
| Tilt | Tilt-Up Base | 3" HD Tilt-Up Base |
*Preliminary engineering estimate; PE-certified rating to follow. See the standard 20' → · The whole HD Series →
Every Band, From One Feedpoint
Every Greyline works every band, 160 through 6. At 20 feet the antenna also runs ahead of a full-radial quarter-wave on 20 through 10 meters in NEC modeling over average ground, strongest on 10. The Greyline is a vertical dipole: return current flows through the lower element, not a buried radial field, so frozen ground, rock and sand don't matter.
Walk It Down Before the Storm
Pair it with the 3" HD Tilt-Up Base, built alongside the antenna. When the forecast turns, walk the pole down, one person, no ladder; every height change happens at waist level too. 10% off with the HD in the cart. Bart, N1BRL, down and back up in two minutes →
Specs
| Height | 20 feet; grows with sections above or below the feedpoint |
| Pole | Oversized heavy-duty base, 6061-T6 aluminum, stainless hardware |
| Bands | Every band, 160-6M, one feedpoint |
| Radials | None |
| Wind | About 124 mph (preliminary engineering estimate); PE-certified rating to follow |
| Foundation | Heavy-duty concrete foundation, set plumb; drawing on the Assembly Documents page; PE-designed foundation for exposed or critical sites |
| In the box | 20' HD radiator with top truck, feedline kit (ladder line, five snap-on ferrites, ladder-line to PL-259 adapter, spacers). Every document online, always current. |
| Ships | In 1-2 weeks; free to the USA and Canada |
| Warranty | 7 years |
Ham Radio is fun again! Pass it on… 73, Jon KL2A · Greyline Performance · 435-200-4902