Build a 10 Meter Vertical Antenna
The 10m quarter-wave vertical is one of the easiest DX antennas on this site to build — at just over 8 feet tall it fits on nearly any rooftop, deck, or small lot, yet delivers a low-angle radiation pattern well suited to the worldwide F2-layer and sporadic-E openings that make 10m so exciting. This guide covers the complete build from element sizing through radial installation, feedpoint assembly, and final tuning for 28 MHz operation.
Quarter-Wave Vertical Fundamentals at 28 MHz
The 10m quarter-wave vertical operates on exactly the same principle as the 20m and 40m verticals on this site — one half of a dipole, with the ground plane providing the missing half electrically. The higher frequency at 28 MHz means an even shorter, lighter element than the already-compact 20m version:
A single 9-foot length of aluminum tubing handles the entire element with no telescoping needed — one of the simplest builds in this vertical family.
10m vs 20m Vertical — Key Differences
Building a 10m vertical differs from the 20m version in a few important ways operators should understand before starting:
- Element is about half the length: 8.24 ft vs 16.5 ft — even easier to support than the already-compact 20m build. A single section of 0.75-inch aluminum tubing is plenty.
- Radials are correspondingly shorter: 10m radials are ~8.24 ft each — a full 16-radial system uses roughly half the copper of the 20m version.
- Much wider band in percentage terms: 10m spans 28.000–29.700 MHz, 1.7 MHz wide — around 6% of center frequency, noticeably wider than 20m's 2.5%. A vertical cut for 28.400 MHz shows more SWR rise toward 29.700 MHz than the 20m antenna shows across its own band.
- Solar-cycle-dependent performance: unlike 20m, which is reliably open somewhere on Earth nearly every day, 10m's usefulness varies dramatically with the solar cycle — spectacular during solar maximum, quieter (though never fully dead thanks to sporadic-E) during solar minimum.
- Excellent rooftop and portable candidate: the tiny size makes 10m one of the easiest HF verticals to mount virtually anywhere.
Radiation Pattern and DX Performance
10m propagation swings between two very different characters depending on solar activity, and the vertical's low angle pays off in both:
Because 10m's wavelength is so short, even a modest-height dipole already achieves a reasonably low radiation angle — the vertical's advantage over a dipole is less dramatic here than on 40m, but still meaningful for stations without much support height available.
Element Construction Options
Three practical approaches, all straightforward at this size:
- Single aluminum tubing section: a single 9-foot length of 0.75-inch OD 6061-T6 aluminum tubing handles the 8.24-foot element with no telescoping required.
- Stainless steel CB-style whip: a longer CB or ham-specific stainless whip (8–9 ft) works directly, trimmed to length.
- Fishing pole with wire: a 3-meter (10-foot) fiberglass fishing pole with #18 AWG copper wire taped along the outside is extremely lightweight and portable — ideal for POTA/SOTA activations where 10m's DX potential per pound carried is hard to beat.
| Target frequency | Band segment | Element length (ft) | Element length (m) | Notes |
|---|---|---|---|---|
| 28.000 MHz | CW bottom | 8.36 ft | 2.55 m | Cut here for CW-only operation |
| 28.074 MHz | FT8 / digital | 8.34 ft | 2.54 m | FT8 and FT4 calling frequency |
| 28.400 MHz | Compromise (recommended) | 8.24 ft | 2.51 m | Best all-around compromise across CW and phone |
| 28.500 MHz | Phone segment begins | 8.21 ft | 2.50 m | Start of the wide General phone allocation |
| 28.900 MHz | Phone / DX | 8.10 ft | 2.47 m | Good alternate cut if phone is your priority |
| 29.600 MHz | FM simplex | 7.91 ft | 2.41 m | Near the FM/repeater sub-band |
| 29.700 MHz | Band top | 7.88 ft | 2.40 m | Upper band edge — not recommended as center point |
Vertical 10m Calculator
Materials for a ground-mounted 10m quarter-wave vertical with 16-radial ground plane
What the NanoVNA Will Show
The 10m vertical feedpoint behaves the same as its lower-band siblings, with one band-specific wrinkle worth noting:
Rooftop and Portable Installation Considerations
The compact 10m vertical is an excellent candidate for rooftop or portable installations:
- Use elevated radials: on a roof or deck, 4 elevated radials at λ/4 length (8.24 ft) perform almost as well as a full on-ground system.
- Height benefit: because the wavelength is so short, even a modest rooftop or upper-floor mounting height represents a large fraction of a wavelength, meaningfully lowering the takeoff angle.
- Metal roof interaction: keep the element base at least 2–3 feet above a metal roof surface to avoid detuning.
- Wind load: a 9-foot 0.75-inch aluminum element is very light — a simple deck rail mount or rooftop tripod with light guying handles it easily.
Building the 10m Quarter-Wave Vertical
This guide builds a ground-mounted single-section aluminum tubing vertical with a 16-radial on-ground system. Notes for fishing-pole and elevated installations are included at relevant steps.
Select the Site and Plan Radial Layout
Choose a site with at least 9 feet of clear ground in all directions from the element base. Key site criteria:
- Clear of metal structures within 5–8 feet: metal fences, gutters, or downspouts within this range cause measurable detuning.
- Coax exit at 90°: route the coax perpendicular to the element for the first several feet before turning toward the shack.
- Rooftop option: the 10m vertical is small enough to mount on a roof tripod or chimney mount with 4 elevated radials if a ground installation isn't possible.
Cut the Aluminum Tubing Element
Cut the 0.75-inch OD aluminum tubing to 8.75 feet (105 inches) — longer than needed to allow trimming to exact resonance. Use a tubing cutter for a clean square cut; deburr both ends.
Install the Base Mount and Feedpoint Assembly
Install the base mount at the chosen site. The 10m element is light enough that a simple mount suffices — a fence post anchor driven 18 inches into the ground with a PVC or nylon coupling at the top handles a 9-foot 0.75-inch aluminum element with ease.
Mount the SO-239 feedpoint connector at the element base with the center pin connecting to the element and the shell connecting to the radial hub.
Install the Radial Hub and Run 16 Radials
Install a copper radial plate at the base of the element, connected to the SO-239 shell. Cut 16 radial wires of #14 AWG copper at 8.75 feet each. Crimp a ring terminal on one end of each and bolt all 16 to the radial hub. Space evenly at 22.5° intervals and stake flat to the ground every 4–5 feet.
Raise the Element and Connect Coax
A 9-foot single-section aluminum element is light enough for one person to raise alone — slide it into the base mount sleeve and secure it. Connect the coax: center pin to element, shield to radial hub. Install the current choke at the feedpoint — 5–6 turns of coax through an FT-240-31 toroid.
Weatherproof the SO-239/PL-259 connection with self-amalgamating tape.
Initial SWR Measurement
Connect the NanoVNA at the shack end of the coax. Sweep 27.0–30.0 MHz and locate the SWR minimum.
Trim to Resonance
Lower the element and trim from the top end to raise the resonant frequency to the target:
Repeat until the SWR minimum falls at or within ±50 kHz of the target. Final SWR at resonance should be below 1.5:1.
Verify Full Band SWR and Document
Weatherproof all connections with self-amalgamating tape and RTV sealant at the base. Install a ground rod adjacent to the element base and bond it to the radial hub for lightning protection.
4 Elevated Radials for Rooftop Installation
The 10m vertical is one of the most practical HF verticals for rooftop installation. The short element (8.24 ft) and short radials fit on a typical residential rooftop with a simple tripod mount:
- Radial length: 8.24 ft each — same as the element. Cut 4 radials of #16 AWG insulated wire at 8.5 ft each.
- Radial orientation: run the 4 radials outward from the base in four cardinal directions.
- Height above roof surface: keep the element base and radials at least 2 feet above the roof surface.
- Performance: 4 elevated radials on a rooftop perform excellently given the added height benefit at this short wavelength.
Portable 10m Vertical — Field Deployment
The 10m quarter-wave vertical is popular for POTA and SOTA activations thanks to its small size and DX potential:
- Element: a 3-meter fiberglass telescoping fishing pole with #18 AWG wire taped along the outside.
- Radials: 4 × 8.5 ft lengths of thin wire on a small storage card.
- Feedpoint enclosure: a small weatherproof project box with an SO-239 and current choke.
- Performance: during a good F2 or sporadic-E opening, a QRP 10m vertical routinely works stations across continents.
| Symptom | Most likely cause | Diagnosis | Fix |
|---|---|---|---|
| No SWR dip visible across 27–30 MHz | Feedpoint connection fault or coax polarity reversed | Check DC resistance from coax center to shield — should be open circuit | Verify center pin to element, shield to radial hub; check connectors for shorts |
| SWR minimum is broad or unusually high | Too few radials — high ground resistance | Count and check radial connections at the hub | Add radials toward 16; verify each has a clean connection at the hub |
| Resonance shifts between morning and afternoon | Loose element base joint or nearby structure thermal expansion | Check element mount tightness | Tighten base mount; move away from nearby metal if present |
| SWR correct but strong RFI on receive | No current choke — coax radiating | Key up at low power and check for RF on the coax outer near the radio | Install FT-240-31 current choke at feedpoint, 5-6 turns |
| Resonance too high after trimming | Element trimmed too short | Measure element length against target | Splice a short extension onto the tip using a sleeve coupler; re-trim |
| Good SWR but nothing heard during a known F2/sporadic-E opening | Antenna too low, or opening didn't reach your location | Check DX cluster spots and beacon reports | Not necessarily a fault — confirm the opening's actual geographic reach before troubleshooting further |
Can I use a 10m vertical on other bands without a tuner?
Not usefully — unlike the 20m vertical, which has a convenient harmonic relationship with 10m, a 10m-cut vertical doesn't line up with any other ham band's fundamental. Treat this as a dedicated single-band antenna.
How many radials do I need for the 10m vertical?
The same rule applies as on other bands — more is better, with the biggest gains in the first 8. Because 10m radials are so short, a full 16-radial system is inexpensive and easy to fit even in a small yard.
Is a 10m vertical better than a 10m dipole for DX?
At low support heights (under 15 feet), yes, clearly. Because 10m's wavelength is short, even a modest-height dipole (20+ feet) already achieves a fairly low radiation angle, making the contest closer than it would be on 40m or 80m.
Can I mount a 10m vertical on my roof?
Yes — a rooftop 10m vertical with 4 elevated radials is an excellent, easy installation given the antenna's small size and light weight.
Does this antenna work during solar minimum?
Yes, though less dramatically than during solar maximum. Summer sporadic-E openings occur independent of the solar cycle and still deliver strong regional contacts even when F2 propagation is largely absent.