Information Station Specialists Website     

HAM icon The Lowdown
630 Meter Antenna for Amateur Radio  

 

630 Meter AntennaThe Lowdown Antenna offers amateur radio enthusiasts a convenient way to operate on 630 meters in a confined space. Designed to be centered above a horizontal groundplane, this antenna is amazingly compact and lightweight, making it simple to set up, take down, transport and store. Its inductively center-loaded, base-fed design and capacitive top hat yield excellent efficiency given its compact size. 


Product Specifications     |     Warranty     |     How to Order
 Specifications *
TypeLF base, vertical, whip, omnidirectional.
Feedpoint Impedance20-33 ohms with 25’-10' radius groundplanes, respectively.
MatchingTransmission line transformer may be used to match impedance for best efficiency.
EfficiencyUp to 2.5%.
Power Rating200-watt carrier (approx).
Frequency CoverageTunable 472 – 479 kHz (630-meter band).
Operating Height AGL24’ nominal.
Assembled Length21.54’.
Element DiametersBase 1.5”; coil 3.75”; midtip / tip 1.5”/1.0”.
Capacitive Hat120” diameter (maximum).
Breakdown4 pieces plus 6-element capacitive top hat, longest element 94”.
Tuning AdjustmentsCapacitive top hat diameter (spoke length).
Weight18.9 lbs.
MaterialAluminum (anodized), fiberglass reinforced PVC.
HardwareStainless steel.
Feedline Connector¼” screw stud.
Mounting Type Recommended1.5” insulated block mounts.
Mounting FormatTop of mast or pole.
Mounting Structure4” 4x4 wood post (typical).
Wind Surface Area3.15 square feet.
Wind Survivabilty Rating140 MPH guyed; 100 MPH unguyed (48” mount separation).
Bandwidth3 kHz (3:1 SWR); 2 kHz (2:1 SWR).
Instruction ManualClear instructions for ease of use. (630PD)
Optional AccessoriesTHEMATCHBOX Matching Transformer (MB.22)
FlexPlane Groundplane (PRO10 or PRO25)
Insulator Mounts with Standoffs (M7B21)
Lowpass Filter for 630 Meters (LP.630.PD)
Portable Antenna Stand (PSTND26)
Print this Product Data Sheet.
   (*) The above specifications are subject to change without notice. 
Our Promise – Lifetime Technical Support   |   General Warranty   |   Returns / Replacements

How to Order – Information Station Specialists, Inc., doing business as The Radio Source, is the manufacturer of the Lowdown Antenna for amateur (ham) radio operators. To provide convenient ordering and customer service, the Lowdown Antenna will soon be sold exclusively through DX Engineering.

You will soon be able to click the DX logo (right) to order. >>>>
For Until then, please email or call 616.772.2300 x102 (9-5 Eastern) to order or ask questions.		DXEngineering Logo
   2026 HAMvention Forum Features 630 Meter Band

Paul Dobosz QST AwardPlay video of "Operating on 630 Meters; Practical and Easy Ways to Get on the Band" forum.

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.

At this link, get Paul's lowdown on 630-meter HAM products.
 
   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 case study.
Ralph E. Taggart, WB8DQT
“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 case study.
Tom Costa, N9RU


The Lowdown in situ