POTA & Field Antenna — Greyline DX Vertical, No Radials

Parks on the Air — Field Operations

The Park Doesn’t Owe You a Tree.

Most portable antennas need something: a tree, a mast, a radial field. A Greyline DX Vertical needs none of them. It is a vertical dipole: the lower half of the antenna is already in the air, so there is no radial field to lay and no counterpoise wire to string. Concrete pad, gravel lot, sand, or snow — no radials to lay on any of them.

Every height works every band, 160 through 6, with a tuner. Pick the height your vehicle and your park can carry.

Why It Works in the Field

Three Reasons Operators Switch

Setup

Minutes, Not Hours

The 4-foot sections slip together with the couplers already bolted on, and the coax connects at the base. No wires to string, no radials to lay, no tree required.

Physics

A Dipole, Standing Up

Return current flows through the lower element instead of through the soil, so there is no ground loss in series with the feed and no radial field to lay. The ground still shapes the far-field pattern, as it does for every vertical — a park by the water is a gift — but the antenna does not depend on it.

Noise

Smallest Possible Footprint

A 2-inch pole and nothing on the ground. Put the base in the quietest corner of the park — away from parking-lot lighting, picnic-shelter wiring, and whatever else the RF environment offers.

Modeled radiation patterns: Greyline VDA 20 and 28 ft compared with two traditional multiband verticals

Modeled radiation patterns: Greyline 20’ and 28’ VDA against two traditional multiband verticals. Lower takeoff angle means more signal toward the horizon, where the DX is.

More Aperture in the Field

The 9’ DX Whip on Top

The 9’ DX Whip, adjustable from 3 to 11.5 feet, threads into the top cap of any Greyline DX Vertical by hand. It adds radiator where the low bands want it and moves the bonus gain down the dial toward 17 and 20 meters — nine more feet of antenna that packs as a single piece.

The feed system is the same as at home: the ladder line inside the pole, the adapter and the 1:1 choke at the base, coax to your tuner. No 4:1 or 9:1 — the tuner does the matching, band by band, and the choke keeps RF off the coax. A small remote or auto-tuner at the base makes the field station one cable long.

The 9’ DX Whip →

Head to Head

How the VDA Stacks Up

Most portable operators choose between an end-fed wire, a magnetic loop, and a vertical. All three are valid. Here is the honest comparison:

The Challenge Greyline VDA End-Fed Wire Mag-Loop
Tree or Mast Required? No — self-supporting on a base Needs a pole or tree at height Self-supporting
Ground / Radials? None required Counterpoise often helps None required
Bands 160–6 with a tuner Harmonic bands, or a tuner Retune every band; narrow bandwidth
Low-Angle DX Its strength Depends on height and slope Small aperture
Hard Surface Deploy? Yes, on a base — no stakes, no radials Needs an anchor for the mast Yes
Noise Footprint 2” — place anywhere Wire spans are fixed Small, but close to the operator

Honest note on the end-fed: a good end-fed wire on a 20’ mast is a capable antenna, and many great activators use one. The VDA wins on deployment independence — when there is no tree, no soft ground for stakes, or you are on concrete or rock — and on low-angle reach. If those constraints exist in your parks, the VDA is the answer.

Which Model for the Field?

Match the Antenna to the Activation

Model Wind Rating (no flag) Best Field Fit
12’ DXV 155 MPH High-wind parks, coastal, vehicle-portable, exposed ridgelines. The most compact self-supporting option; strongest on 15 through 10.
16’ DXV 115 MPH Standard parks, picnic-area setups, day trips. Strong from 17 meters up, solid on 40.
20’ DXV 90 MPH Base-camp activations, truck or trailer transport, operators who want more low-band aperture in the field.
24’ DXV 70 MPH Established park stations, drive-up sites, extended operations where maximum aperture is worth the carry.

ASCE 7-10 ratings for the bare vertical. Add the 9’ whip and the rating steps down; in the field, lower the whip or the pole when the wind comes up. For a hard-surface base, call us and we will talk through what fits your vehicle and your parks.

Ready for Your Next Activation?

Choose your height below, or call if you want to talk through the right configuration for your operating style. Every antenna ships with its feedline kit, full setup documentation, and personal support from the people who build them — free to the USA and Canada.

435-200-4902 — Sun Valley, Idaho

Ham Radio is fun again! Pass it on… 73, Jon KL2A