Build a 17 Meter Vertical Antenna
The 17m quarter-wave vertical pairs the easy, compact build style of this family with a quiet, contest-free WARC band known for productive late-afternoon and early-evening DX. At just under 13 feet tall, it's a straightforward single-section build, and because the entire 17m allocation is only 100 kHz wide, a single well-tuned vertical covers the whole band with excellent SWR. This guide covers the complete build from element sizing through radial installation, feedpoint assembly, and final tuning for 18.1 MHz operation.
Quarter-Wave Vertical Fundamentals at 18.1 MHz
A single 14-foot length of aluminum tubing handles the element with no telescoping required.
17m vs 12m Vertical — Key Differences
- Element is slightly longer: 12.92 ft vs 12m's 9.38 ft — still a straightforward single-section build.
- Radials are correspondingly longer: 17m radials are ~12.9 ft each.
- Same narrow-band, no-contest character: like 12m and 30m, 17m is a 100 kHz-wide WARC band with no contest activity.
- Often the best late-day DX band on this site: 17m frequently stays open into the late afternoon and early evening after 15m and 12m have started to close.
Radiation Pattern and DX Performance
As with 15m, the 17m vertical offers a clear DX advantage for stations without a support taller than about 25 feet.
Element Construction Options
- Single aluminum tubing section: a single 14-foot length of 0.75-inch OD 6061-T6 aluminum tubing handles the 12.92-foot element with no telescoping required.
- Stainless steel whip: a longer ham-specific stainless whip (13–14 ft) works directly, trimmed to length.
- Fishing pole with wire: a 4.2-meter (14-foot) fiberglass fishing pole with #18 AWG copper wire taped along the outside makes a lightweight, portable option.
| Target frequency | Band segment | Element length (ft) | Element length (m) | Notes |
|---|---|---|---|---|
| 18.068 MHz | Band bottom | 12.95 ft | 3.95 m | Bottom of the 17m allocation |
| 18.100 MHz | FT8 / digital | 12.93 ft | 3.94 m | FT8 calling frequency |
| 18.110 MHz | Phone begins | 12.92 ft | 3.94 m | Start of the phone portion |
| 18.118 MHz | Band center (recommended) | 12.92 ft | 3.94 m | Best all-around cut — covers the whole band |
| 18.168 MHz | Band top | 12.88 ft | 3.93 m | Upper band edge |
Vertical 17m Calculator
Materials for a ground-mounted 17m quarter-wave vertical with 16-radial ground plane
What the NanoVNA Will Show
Rooftop and Portable Installation Considerations
- Use elevated radials: 4 elevated radials at λ/4 length (12.92 ft) perform nearly as well as a full on-ground system.
- Metal roof interaction: keep the element base at least 2–3 feet above metal roofing.
- Wind load: a 14-foot 0.75-inch aluminum element is light enough for a simple mount with light guying.
Building the 17m Quarter-Wave Vertical
This guide builds a ground-mounted single-section aluminum tubing vertical with a 16-radial on-ground system.
Select the Site and Plan Radial Layout
Choose a site with at least 14 feet of clear ground in all directions. Keep the element clear of metal structures within 5–8 feet, and route the coax to exit the feedpoint at 90°.
Cut the Aluminum Tubing Element
Cut the 0.75-inch OD aluminum tubing to 13.5 feet (162 inches) — longer than needed for trimming. Deburr both ends.
Install the Base Mount and Feedpoint Assembly
Install a lightweight base mount. Mount the SO-239 with the center pin to the element and shell to the radial hub.
Install the Radial Hub and Run 16 Radials
Cut 16 radials of #14 AWG copper at 13.5 feet each, bolt them to the hub at 22.5° intervals, and stake flat to the ground.
Raise the Element and Connect Coax
Slide the element into the base mount. Connect the coax, install a current choke (6–7 turns of coax through an FT-240-31 toroid), and weatherproof the connection.
Initial SWR Measurement
Sweep 17.0–19.0 MHz with the NanoVNA.
Trim to Resonance
Verify Full Band SWR and Document
Weatherproof all connections and bond a ground rod at the base to the radial hub.
4 Elevated Radials for Rooftop Installation
The 17m vertical fits on most residential rooftops with a simple tripod mount, using 4 elevated radials at 12.9 ft each.
Portable 17m Vertical — Field Deployment
A 4.2-meter fiberglass fishing pole with #18 AWG wire, paired with 4 short ground radials, makes an effective field vertical — and 17m's late-afternoon DX window is a great match for a typical POTA activation schedule.
| Symptom | Most likely cause | Diagnosis | Fix |
|---|---|---|---|
| No SWR dip visible across 17–19 MHz | Feedpoint connection fault or coax polarity reversed | Check DC resistance from coax center to shield | Verify center pin to element, shield to radial hub |
| SWR minimum broad or high | Too few radials | Count radial connections at the hub | Add radials toward 16 |
| Resonance below 18.068 MHz | Element too long | Measure element length | Trim — 1 inch raises resonance ~45-50 kHz |
| Resonance above 18.168 MHz | Element too short | Measure element length | Splice a short extension onto the tip |
| SWR correct but noisy receive | No current choke | Check for RF on the coax outer near the radio | Install an FT-240-31 current choke at the feedpoint |
| Band seems dead midday | Normal propagation lull for 17m | Check propagation reports for time of day | Not a fault — try late afternoon/early evening, 17m's typical strong window |
Why is 17m only 100 kHz wide?
17m is a WARC band allocated in 1979 as a narrow, non-contest slice, like 12m and 30m.
Is 17m good for DX?
Yes, especially in the late afternoon and early evening — a favorite window when 15m and 12m have started to close but 20m is still crowded.
How many radials do I need?
More is better, with the biggest gains in the first 8; 16 is easy at this radial length.
Why doesn't 17m have contests?
Like the other WARC bands, it was set aside without contest activity when allocated in 1979.
Can I mount this on my roof?
Yes, with 4 elevated radials — an easy installation.
How does 17m compare to 12m for propagation?
17m is somewhat less solar-cycle dependent and tends to stay usable more consistently than 12m or 10m.