HOA Architectural Brief | Greyline DX Flagpole Antenna

HOA & Architectural Review Brief

The Greyline DX Flagpole Series

A printable brief prepared for Homeowner Association boards, architectural review committees, and family stakeholders evaluating the installation of a Greyline DX Flagpole on a residential property.

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From: Greyline Performance · Sun Valley, Idaho

Subject: The Greyline DX Flagpole Series — Permanent Installation Overview

Introduction

A Permanent Architectural Fixture, Not a Temporary Antenna

The Greyline DX Flagpole is engineered as a permanent residential flagpole whose aluminum sections are themselves an HF amateur radio antenna. There is no separate antenna mounted on it or hidden beside it: the pole is the antenna. From the curb, from the neighbors' windows, and from any reasonable distance, the installation is visually a flagpole — clean lines, a slim aluminum profile, no added antenna elements, no guy wires, and no radial wires across the lawn.

The brief that follows summarizes the construction, structural engineering, and installation footprint for HOA architectural review.

Construction

Materials & Build Specification

Material	6061-T6 aircraft-grade aluminum, 2" outer diameter; the heavy-duty HD models stand on an oversized heavy-duty base
Hardware	Stainless steel throughout; 316 marine-grade available for coastal installations
Finish	Natural aluminum; powder-coat colors available
Available heights	12, 16, 20, 24, 28 feet, plus the heavy-duty 24' HD and 28' HD for high-wind locations
Separate antenna elements	None — the aluminum pole itself is the antenna
Guy wires required	None on standard 12-28 ft heights

Structural Engineering

Wind Ratings per ASCE 7-10

Every Greyline wind rating is calculated against ASCE 7-10 (the structural engineering standard for wind load on structures) using actual pole geometry: height, outer diameter, wall thickness, and projected area. Ratings are height-specific — the shorter, lower-projected-area models carry the highest wind ratings.

Model Height	Flag Flying	Flag Lowered (or No Flag)	Projected Wind Area
12 ft DXF12	100 MPH	155 MPH	2.0 sq ft
16 ft DXF16	75 MPH	115 MPH	2.67 sq ft
20 ft DXF20	60 MPH	90 MPH	3.33 sq ft
24 ft DXF24	50 MPH	70 MPH	4.0 sq ft
28 ft DXF28	35 MPH	55 MPH	4.67 sq ft
24 ft HD, heavy-duty*	to follow	about 107 MPH	heavy-duty base
28 ft HD, heavy-duty*	about 80 MPH	over 90 MPH	heavy-duty base

The flag is the dominant wind load, so the rating is lower while it flies. US federal flag protocol calls for lowering the flag in approaching weather, which is why the flag-lowered figure is the structural number for a storm and matches the bare pole of the same height. *HD figures are preliminary engineering estimates; certified ratings to follow. Engineering methodology and outer diameter specifications are published — the math is verifiable.

For high-wind locations: the HD Series

Same heights and the same look as the standard poles, on an oversized heavy-duty base. The 28' HD carries more than double the wind rating of the standard 28-foot pole with the flag flying, and nearly double with the flag lowered. The 24' HD reaches about 107 MPH with the flag lowered. Built for coastlines, open ground, ridgelines and hurricane country.

For HOA review purposes: the structural engineering meets or exceeds the standards typically applied to permanent residential flagpoles in the same height range. The 2" OD profile is the smallest practical projected area for full-band HF coverage.

Installation Footprint

No Buried Radial Field Required

A standard amateur HF vertical antenna typically requires a buried radial field — dozens of wires extending in all directions across the lawn, often to a radius of 100 feet or more. These radials disrupt landscaping, complicate lawn maintenance, and significantly affect the installation footprint.

The Greyline architecture is different. The antenna is an off-center fed vertical dipole — a balanced design where both halves of the antenna are in the pole itself, rather than one half being a buried ground system. No buried radial field is required. The installation footprint is the pole base itself: a single in-ground sleeve set about 3 feet deep in a hole roughly 12-18 inches across, on gravel and in concrete (the HD models set in a larger concrete foundation). Lawn and landscaping remain undisturbed beyond the immediate pole base.

For HOAs concerned with property aesthetics and neighbor lawn lines, this is the practical advantage worth understanding: the visible installation is one slim aluminum pole and a US flag. Nothing more.

Why HOAs Approve

A Standard Residential Flagpole

From the perspective of an architectural review committee, a Greyline installation is functionally and visually a residential flagpole. Greyline poles have been approved in HOA communities across the United States. They have also been installed in restrictive covenant communities where larger or more conventional antennas would not have been permitted.

If your HOA permits residential flagpoles in the height range you are considering, a Greyline installation typically qualifies under the same architectural review criteria as a non-antenna flagpole of comparable height and material.

For the architectural review board

A Greyline DX Flagpole installation is a permanent residential improvement carrying the same structural engineering rigor (ASCE 7-10) and material quality (6061-T6 aluminum, stainless hardware) as commercial-grade flagpoles. The aluminum pole is itself the HF amateur radio antenna, so there are no separate antenna elements to see from any viewing angle.

Documentation supporting your architectural review — specifications, engineering data, photographs of comparable installations — is available on request.

Documentation & Support

Contact for HOA Documentation

Greyline provides additional documentation for HOA architectural review on request, including model-specific structural specifications, photographs of approved installations, and a Property Integrity statement addressing common board questions about installation impact and removal.

Phone: 435-200-4902 (Sun Valley, Idaho — Mountain Time). Best for direct questions from board members or architectural review committees.

Property Value & Neighbor FAQ → Contact Greyline →

Related Resources

Free HOA Flagpole Approval Letter, Written for You →
HOA Ham Radio Antenna Guide →
HOA Legislation & Federal Law Reference →
Commercial-Grade Flagpole Antenna Guide →
The Shelf We Read From — Authority & Sources →

Ham Radio is fun again. Pass it on... 73, Jon KL2A & the Greyline Performance Team — greylineperformance.com — 435-200-4902

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Essential for every antenna

This turns all antenna work into easy one-man jobs. It also makes storm prep easy - just drop the antenna for the storm, raise it later. It takes less than 5 minutes to go up or down. I can't imagine having an antenna without one. I'm old enough that climbing towers, trees or big ladders just isn't in the playbook any longer, so this is a life-saver for my hobby. Buy one and make your life easier and add years to your ability to work on your antenna. Five Stars!!

Thank you, Rob. “Essential” is exactly the word we hoped for. One tip from another owner: walk it down once a season on a calm day and check the hardware at chest height. Fun season ahead! 73, Jon KL2A

Should be part of every antenna

The tilt base makes it possible to raise and lower the antenna in minutes single-handed with complete safety. The design is simple and robust and I love the fact that it can't over-shoot when raising it. In fact, it is seriously over-built. The only help I needed to install it was lowering the antenna to add the unit. It does raise the halyard cleat but I simply removed it, left the bolts in the original holes and mounted it at a comfortable level with a stainless hose clamp, problem solved. No more worries about the antenna during storms here in Florida. Five minutes and it's on the ground out of the wind.

Great addition to My 20V!

After 2 weeks of use I can safely say that the 9' whip is a great addition to my 20V! My rough calculations show about a 2+ db improvement overall. On the receive side the most dramatic indicator is that I am getting approximately the same signal strength without the preamp on most bands. I am also getting more reports in the + range on FT8 than previously. I have used PSK reporter to get a general picture of my RF footprint and signal strength compared to to the original 20v w/ previous reports. I have also been able to work several new countries that I could not work previously...India, Franz Joseph Land, Kahazakistan. India is certainly not rare but it has taken me three years to eliminate my "blind spot". Swr is well below 1.3/1 on all bands 80m-6m using the LDG RT-100 at the antenna. All in all could not be more pleased with the 9" whip addition!

Franz Josef Land and Kazakhstan on nine more feet — that's the report every whip page wishes it had. Thank you, Craig. Your words are on the page now. 73, Jon KL2A

Better base.

I want a 6ft x 18in hole. That is what the backhoe bucket is going to dig. I will need my own base tube, and a whole lotta concrete! I bought this extender to allow a more accurate vertical alignment while dumping in the concrete.

A 6-foot hole will hold anything we build. One tip while the concrete goes in: check plumb from two directions, 90° apart, then leave it alone for 24 hours. Send us a photo when it’s up! 73, Jon KL2A

Product is good. But I need a quick instruction sheet. You remove the bottom tube and replace it with the antenna base. Then the tube you removed connects the the top of the arm and to the insulated base of the antenna. Now I can lower my 24’ antenna without help.

Thank you, Dale. You were right, so we made one: the one-page Tilt-Up Base Instructions (install, lower, raise) now sit on the product page, because of your review. Have the best season yet! 73, Jon KL2A