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HAM RadioThe Lowdown 630 Meter Antenna for Amateur Radio
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630 Meter Antenna


The Lowdown Amateur Radio Antenna offers amateur radio enthusiasts a convenient way to operate on 630 meters in a confined area. Designed to be centered above a horizontal groundplane, this "HOA-friendly" antenna is amazingly compact and lightweight, making it simple to set up, take down, transport and store. Its center-loaded, base-fed design and capacitive top hat yield excellent efficiency given its compact size. Accessories such as insulator mounts, matching transformers, junction enclosures and preassembled groundplanes are available as well. 

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Specifications *  Download a PDF of specs. 
  • Type: LF base, vertical, whip, omnidirectional.
  • Impedance: 20-33 ohms with 25’-10' radius groundplanes, respectively.
  • Matching: Transmission line transformer may be used to match impedance for best efficiency.
  • Efficiency: up to 3.0 %.
  • Power rating (approx.): 200-watt carrier.
  • Frequency coverage: 472 – 479 kHz (630-meter band).
  • Operating height AGL: 24’ nominal.
  • Assembled length: 21.54’. 630 Meter Antenna Full View
  • Element diameters: base: 1.5”; coil: 3.75”; midtip/tip: 1.5”/1.0”.
  • Capacitive hat: 120” diameter (maximum).
  • Breakdown: 4 pieces plus 6-element capacitive top hat, longest element 94”.
  • Tunable adjustments: capacitive top hat diameter (whip length).
  • Weight: 18.9 lbs.
  • Material: aluminum (anodized), fiberglass reinforced PVC.
  • Hardware: stainless steel.
  • Feed line connector: ¼” screw stud.
  • Mounting type recommended: 1.5” Insulated, block mounts.
  • Mounting format: top of mast or pole.
  • Mounting structure: 4” pole, 4’ height (typical).
  • Wind surface area: 3.15 square feet.
  • Wind survivability rating: 140 mph guyed; 100 mph unguyed (48” mount separation).
  • Bandwidth: 6 kHz (3:1 SWR); 4 kHz (2:1 SWR).
Optional Accessories

(*) Specifications are subject to change without notice.

2026 HAMvention Forum Features New 630-meter band

Paul Dobosz QST Award
Click here to watch a YouTube video of the forum "Operating on 630 Meters; Practical and Easy Ways to Get on the Band"

Paul Dobosz (K8PD) who led the forum consults with Information Station Specialists on special engineering projects, such as The Lowdown Antenna. At Hamvention, Paul was awarded a QST Cover Plaque for his popular article "Practical 630-Meter Operation for the Average Radio Amateur," ARRL, Feb 2026, pictured left with the plaque.

You can also get "the lowdown" on 630-meter HAM products from Paul.

TEST Report (Click the map to enlarge it.)
The Lowdown 630 Meter Antenna Testing Map

Customer Reviews
 
“Information Station Specialists has designed an antenna that permits those of us, with smaller lots and nearer neighbors, the fun of working 630 meters."
See a case study.
Ralph E. Taggart, WB8DQT
Mason, MI
“Pretty impressive for such a small antenna ... These are so easy to tune compared to homebrew ... After comparing my previous coverage and having about a month of QSOs, people are impressed!"
See a case study.
Tom Costa, N9RU
Marion, IL
“I think you've created the ONLY plug-and-play 630 meter antenna out there."
Jamie Labadia, N2VJ
Windham, NY