Skyline Series · Heavy-Duty · 37 Feet · 160-6M · No Radials · Made in USA
The Skyline 37 HD: Thirty-Seven Feet on the Strongest Base, Built to Grow.
The 28' HD with the 9' DX Whip on top: 37 feet of HF vertical, every band 160 through 6 from a single feedpoint, no radials, built on an oversized heavy-duty base. The same height as the Skyline 37, for sites where the wind makes the decision: open ground, ridgelines, coastline, high plains and northern winters.
Two Reasons People Choose HD
Wind today. About 86 mph with the whip on, 37 feet in the air (preliminary engineering estimate; PE-certified rating to follow), against about 55 for the standard Skyline 37.
Height tomorrow. The heavy-duty base is a platform. Add a section under the whip and it is a Skyline 41 HD, the tallest Greyline. 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.
Why the Whip Pays
Height is aperture. On 40, 80 and 160, where every backyard vertical is electrically short, nine more feet adds radiator exactly where it counts. Higher up the dial, the antenna's strongest band moves down from 10 meters toward 17 and 20. In NEC modeling over average ground, a 37-foot Greyline reaches about +4 dBi on 17 meters at the best DX angle, and every band still works.
Which 37-Footer? Same Antenna, Two Builds
| Skyline 37 | Skyline 37 HD | |
| Signal | Identical: 37 feet, every band 160-6M, same feedpoint | |
| Base | Standard 2-inch 28' | Heavy-duty 28' HD base |
| Wind | About 55 mph; tilt it down ahead of a big storm | About 86 mph at full height* |
| Built for | Most yards | Sites where wind is the design problem; owners who plan to grow the pole |
| Price | $1,445 | $2,390 |
| Tilt | Tilt-Up Base | 3" HD Tilt-Up Base |
*Preliminary engineering estimate; PE-certified rating to follow. See the standard Skyline 37 → · The whole HD Series →
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.
Walk It Down Before the Storm
Pair it with the 3" HD Tilt-Up Base, built alongside the antenna with the same one-direction pivot that stops dead at vertical. One rule for every tall antenna: when the forecast turns, walk it down; one person, no ladder, and every height change at waist level. 10% off with the HD in the cart. Bart, N1BRL, down and back up in two minutes →
Specs
| Height | 37 feet (28' HD + 9' DX Whip, whip adjustable); grows with sections above or below the feedpoint |
| Pole | Oversized heavy-duty base, 6061-T6 aluminum, stainless hardware |
| Bands | Every band, 160-6M; strongest on 17M (about +4 dBi, NEC) |
| Design | VDA, Vertical Dipole Antenna, off-center fed |
| Radials | None |
| Wind | About 86 mph at 37 feet with the whip (preliminary engineering estimate); PE-certified rating to follow |
| Foundation | About 12 cubic feet of 3,000 psi concrete over gravel, set plumb; PE-designed foundation for exposed or critical sites; drawing on the Assembly Documents page |
| In the box | 28' HD radiator, 9' DX Whip, 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; worldwide at carrier cost |
| Home | Designed and built in the Mountain West · KL2A and HQ in Sun Valley, Idaho |
| Warranty | 7 years |
Ham Radio is fun again! Pass it on… 73, Jon KL2A · Greyline Performance · 435-200-4902