Where to Mount an HF Vertical: Height, Water & Ground
Where to mount your Greyline: height, location, and ground.
Ground level or rooftop? Lake dock or oceanfront? Condo courtyard or front entry? Does a shorter antenna give up the low bands? These are the questions operators ask before the post goes in — and the modeling answers them clearly. Here is how a Greyline behaves where you actually put it.
Mounting height: ground, eave, peak, or tower
Antennas like height — but most of us mount at ground level, and the good news is that a Greyline plays well there. These plots model a 20’ Greyline at four heights: ground level, house eave, house peak, and tower top, across 10, 20, 40, and 80 meters.
Mounting height key: 1ft ground red · 10ft eave blue · 25ft peak green · 50ft tower orange.
Two things stand out. On 80M, the ground-mounted 20’ holds up remarkably well against the 50’ tower install — encouraging for those of us without a tower. And on 10 through 40M, the ground-mounted vertical competes with the 50’ install for both gain and low takeoff angle. That low angle is what works real DX — not bad for a 20-foot antenna at ground level. If you can go taller, the 24’ and 28’ add punch and a lower angle on the lower bands.
Greyline 12’, 16’, 20’, and 28’ compared across the bands.
Front-yard visible? The flagpole version. Out of sight on a roofline or back corner? The bare vertical. Same antenna, and the pole itself is the antenna either way.
Do the shorter models give up the low bands?
The low bands want length — a quarter wave is 66 feet on 80M and 135 feet on 160M. That is a tall tower or a tall tree. So the fair question about a 12’ or 16’ Greyline is: how much do you give up? Some efficiency, yes — physics always charges a short antenna on the low bands — but far less than most people expect. With a tuner doing the matching, operators work 160 through 6 meters on the 16-footer, morning, noon, and night. And every foot you add is aperture where the low bands want it most.
Greyline 12’, 16’, and 20’ (no radials) vs. a 20’ base-fed vertical with 16 radials. Look at the low angle and gain on 80 and 40M.
From the Field
“Got Indonesia (YB) this morning on 40m SSB with 100 watts. Over 9,000 miles!”
— a Greyline operator, on a short flagpole
A short Greyline against a base-fed vertical with 16 buried radials holds its own. To clearly beat it with a radial-dependent vertical, the answer is more copper — a lot more, with dozens of radials before the difference is dramatic. Or skip the radial field entirely, which is the whole point of the vertical-dipole design.
Find the quiet spot first
Pro Tip: Run a Noise Audit
Before you choose a location, walk your property with a battery-powered AM radio tuned off-station and listen for local noise — chargers, panels, appliances, a neighbor’s gear. Plant the antenna in the quietest zone, or farthest from the noisiest. The 2-inch footprint is the advantage here: where a buried radial field commits you to one spot, a Greyline goes wherever your lot is quietest. Every dB of noise floor you avoid is a dB you gain on receive.
Docks, lakefronts, and saltwater
Water is your friend. Many operators mount on lake docks — no radials, no guy wires, fastened or roped to the dock, temporary or permanent. Lakefront lots tend to be wide open and quiet, which means a low noise floor and a clean takeoff. If you enjoy tinkering, you can experiment with elevated radials a few inches above the ground or dock — but you do not need them; the vertical dipole works as-is, out of the box.
Oceanfront, bulkheads, and saltwater docks are the best location of all — saltwater is a near-perfect ground screen, miles of it, reinforcing your signal at low angles. Waterfront verticals routinely compete with big inland Yagis on tall towers. Mount within 20 to 30 feet of the water for the strongest effect, though the saltwater boost reaches operators well inland of the shore too. K2DJN: Ten Feet from Salt Water →
Memory Lane · KL2A
Operating as KL2A/9K2 from Kuwait City before CQWW CW — running an 80M Yagi pointed at the USA — the steadiest, loudest signal Jon heard each morning was N2NL/4, working a simple vertical over saltwater from a dock in the Florida Keys. None of the regional big guns could touch it. The big W4 Yagis on 80M faded first. The vertical was the last heard. That is what a vertical over saltwater can do.
— Jon, KL2A
Preparing the site: the dig, the set, the tuner
Once you have found the quiet spot, the install itself is straightforward — one person, a post-hole shovel, and an afternoon. One operator completed the whole process from his wheelchair, no help. You can do this. Print the Assembly Quick Card →
Digging the Hole
Depth: a 3-foot fence-post hole for the 12’ through 24’ models; 4 feet for the 28’. If your ground is genuinely hard to dig, 2 feet is acceptable without much fuss from our structural engineer.
Diameter: typically 8 to 16 inches, per what operators report.
Tip: a Sonotube (a $10–15 cardboard form from the hardware store) keeps the worksite clean and gives a tidy concrete pour. The store can also advise the right hole size for your region’s soil. No hole at all? The Deck and Concrete Mount is the no-dig option.
One-Person Weights
20-foot: 23 lbs · 24-foot: 26 lbs · 28-foot: 35 lbs. Free-standing by design, light enough to handle alone — and with the Tilt-Up Base, you walk it up and down yourself.
Where to put the remote tuner
The tuner is part of the antenna system, so closer to the feedpoint is better — every partial dB counts. But do not fuss: it works well in any reasonable spot. Operators have placed the tuner within a foot or two of the antenna, behind a bush, inside a hollow landscape rock, under a flipped bucket on a shelf, or on a length of PVC. Two rules: keep it at least 6 inches off the ground, and support it with something non-conductive — PVC, wood, or rock. With a remote tuner at the antenna, the choke goes on the radio side of the tuner.
Can you bury the tuner? We had an RF engineer try; after a painstaking run of tests he got it working on most bands — which is to say, don’t. Set it near the antenna or behind a bush, plug in the coax, and it works the first time.
The antenna floats; the station is grounded. The antenna is a dipole — nothing in its RF circuit connects to earth — so the antenna and remote tuner float. Your station should surely be grounded, following the ARRL’s recommendations: for example, a grounded bulkhead entry panel where the feedline enters the building, bonded to the service ground, and surge protectors along the coax, each bonded to ground. With a remote tuner powered over the coax, choose DC-pass protectors.
For the curious
Why a no-radial vertical works on any surface — concrete, rooftop, dock, or saltwater — comes down to the off-center-fed vertical dipole, covered in What Is a VDA → and grounded in the physics on the bookshelf we read from → (Zavrel, Antenna Physics; Kraus, Antennas). Want to size the model to your lot and bands? What height should I buy? → shows every model’s strengths.
Mount One Anywhere
Greyline DX Flagpoles & Verticals
160 through 6 meters from a single feedpoint with a tuner. No radials, no guy wires, a 2-inch footprint — ground, dock, rooftop, bulkhead, or beach. The antenna comfortably handles the full legal limit; your tuner and choke set the system’s power rating, so match them to your station. Free shipping to the USA and Canada.
Keep Exploring
More from the Signal Lab.
The Full Physics & Gain Data →
NEC gain tables and every model’s 5/8λ sweet spot.
Greyline vs. the 43’ Vertical →
Why height stops helping past 5/8 wavelength.
No-Radial HF Verticals: The Physics →
Why the vertical dipole works without a buried radial field.
73, Jon KL2A — 435-200-4902
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