Quick Answer: The Rybakov is a portable, ground-referenced, non-resonant vertical antenna that uses a broadband matching system, a defined radial or counterpoise return path, and—where required—an antenna tuner. Chameleon Antenna can build this operating concept several ways using the SS17 or SS25, a 4:1 reference UNUN, HYBRID-MINI or HYBRID-MICRO, URT1/URT1-MB, or a radiator-matched direct-feed coil for optimized 40-metre operation: CHA M-COIL with SS17, or CHA M25-COIL with SS25.
Naming and search note: This reference uses the canonical spelling Rybakov antenna and also recognises Rybakov 806, IV3SBE, fishing-pole vertical, Rybacov, Ribacoff and Poseidon Rybakov as discovery terms. Product-code variants such as URT-1, M COIL and M25 COIL are search equivalents only; they do not change the controlled hardware configuration.
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Why the Rybakov Matters
The Rybakov has become popular with DX, POTA, SOTA, emergency-communications and travelling operators because one vertical radiator can support several HF bands without installing a separate resonant element for each band. It is fast to erect, compact when packed and well suited to low-angle vertically polarized radiation.
Its simplicity should not be mistaken for magic. The radiator, matching device, coax, choke, radial system, soil and surrounding environment form one antenna system. A low SWR confirms an acceptable impedance match; it does not, by itself, prove high radiation efficiency.
Origins: What We Can Document
The antenna is credited to Enrico, IV3SBE. A surviving mirror of his historical “Rybakov 806 Multiband Antenna” page describes a 7.6-metre vertical radiator, a bifilar broadband transformer, a fibreglass fishing-pole support and an internal tuner when SWR exceeds 2:1. It presents 7.6 metres for operation from 7 MHz upward and suggests radiators between 8.6 and 12 metres for improved 3.5 MHz operation. Later technical sources also document a shorter 4.9-metre variant.
The frequently repeated claim that “Rybakov” simply means “fisherman” is not secure enough to present as fact. A competing public account attributed to IV3SBE says that Rybakov was a family surname and that the antenna first appeared in the Italian Radio Rivista in 2003. Chameleon is attempting to recover that issue and direct inventor evidence. Until then, the naming story and the common interpretation of “806” as “80 through 6 metres” remain clearly labelled historical questions.
| Period | Documented development | Evidence status |
|---|---|---|
| 2003 | Reported first publication in Radio Rivista | Attributed inventor account; original issue still required |
| 2005–2006 | IV3SBE Rybakov 806 web page preserved by web archives | Recovered historical source chain |
| 2009 onward | Independent builders document 7.6 m, 4:1 and tuner implementations | Secondary corroboration |
| More than a decade ago | Chameleon independently develops the MPAS architecture | Owner history; exact public date pending internal records |
| 2024 | MPAS Lite guide documents SS17, HYBRID and counterpoise operating methods | Controlled Chameleon manual evidence |
| 2026 | Controlled Chameleon Rybakov engineering and reference programme begins | Versioned project record |
Why It Keeps Returning
- One lightweight radiator supports several bands.
- The classic broadband path avoids traps and manual coil taps.
- Fibreglass supports and telescoping whips pack compactly and deploy quickly.
- The modular architecture adapts to passive matching, automatic feed-point tuning or optimized 40-metre operation.
- Vertical polarization can provide useful low-angle radiation on appropriate bands.
- The same concept fits DX, POTA, SOTA, travel, emergency and experimental stations.
What Counts as a Rybakov?
For this workshop, the canonical design family combines a portable non-resonant vertical, a broadband or direct feed strategy, a deliberate RF return system and a tuner where required. The approximately 7.6-metre/4:1 arrangement is the historical reference. Shorter or longer radiators, Chameleon’s nominal 5:1 HYBRID networks, URT1 feed-point matching and the radiator-specific 40-metre coil branches are identified as traceable variants—not silently blended into one fictitious specification.
The Rybakov Chameleon Had Already Built
Chameleon Antenna independently developed the MPAS Lite around the same practical architecture now associated with the Rybakov family: a portable vertical whip, broadband unbalanced matching network, defined counterpoise, choked feed line and tuner where required. The relationship is independent engineering convergence—not a claim that Chameleon invented the historical Rybakov.
The 2024 MPAS Lite guide documents an SS17, HYBRID-MICRO or HYBRID-MINI, and approximately 25–35 feet of the supplied wire used as a ground counterpoise. The optional SS25 increases radiator length and brings the system closer to the frequently cited 7.6-metre Rybakov geometry.
Five Chameleon Configurations
| Configuration | Feed system | Best suited to | Important boundary |
|---|---|---|---|
| Classic 4:1 reference | SS25, CHA 4:1 UNUN, external or station tuner | Operators seeking the closest Chameleon equivalent to the commonly published Rybakov recipe | The real transformer, coax and tuner must be evaluated as a complete network |
| HYBRID-MINI broadband | SS17 or SS25, HYBRID-MINI 5:1, tuner where required | Rugged passive portable operation and higher SSB power | Use current component power and duty-cycle limits |
| HYBRID-MICRO broadband | SS17 or SS25, HYBRID-MICRO 5:1, tuner where required | Lower packed burden for POTA, SOTA and QRP operation | Its lower power limits govern the complete system |
| URT1 automatic direct feed | SS25, URT1 and URT1-MB at the feed point | Automatic band changes and minimum high-SWR coax length | Remove the fixed 4:1 or 5:1 transformer; a successful match does not prove efficiency |
| 40 m coil optimized | SS17 + M-COIL or SS25 + M25-COIL, with direct Basic Vertical feed | Operators prioritizing 40-metre performance | Use the coil specified for the radiator; remove the fixed transformer and URT1 |
Which Configuration Should I Choose?
- 40 metres is the main objective: select SS17 + M-COIL or SS25 + M25-COIL according to the deployed radiator.
- Automatic multiband operation is the priority: select URT1 and URT1-MB.
- Passive ruggedness and higher SSB power matter most: select HYBRID-MINI.
- Minimum packed burden matters most: select HYBRID-MICRO.
- You want the common historical 4:1 arrangement: use the Classic reference configuration.
Band Guidance
The classic fixed-length Rybakov is normally treated as a multiband antenna system requiring a suitable tuner. The MPAS Lite also provides a distinct adjustable-whip method. With a 25-foot counterpoise, its guide publishes the following SS17 starting points:
| Band | SS17 length | Guide SWR |
|---|---|---|
| 30 m | 17 ft | 1.9:1 |
| 20 m | 17 ft | 1.5:1 |
| 17 m | 17 ft | 1.3:1 |
| 15 m | 12 ft | 1.4:1 |
| 12 m | 12 ft | 1.1:1 |
| 10 m | 12 ft | 1.2:1 |
| 6 m | 5 ft | 1.3:1 |
These are manufacturer-guide values for the documented SS17 and 25-foot-counterpoise arrangement. They are starting points, not guaranteed results for every soil, mount or environment, and they must not be transferred to a fixed fully extended SS25 configuration.
Practical 4:1 Versus 5:1 Settings
The useful comparison is between complete operating profiles rather than transformer ratios alone. The classic 4:1 profile uses the fully extended SS25, a repeatable four-wire radial system and a tuner where required. The MPAS-derived 5:1 profile uses the SS17 adjustments and single 25-foot counterpoise published in the MPAS Lite guide.
| Band group | Classic 4:1 starting profile | MPAS 5:1 starting profile | Preferred workshop path |
|---|---|---|---|
| 80 m | SS25, four 33 ft radials, tuner mandatory | Optional SS25, 25–35 ft counterpoise, tuner mandatory | Experimental; no efficiency promise |
| 40 m | SS25, four 33 ft radials, tuner normally required | Optional SS25, 25–35 ft counterpoise, tuner normally required | SS17 + M-COIL or SS25 + M25-COIL for the dedicated loaded path; URT1 for automatic matching |
| 30–17 m | SS25, four 25 ft radials, tuner as required | SS17 at 17 ft, one 25 ft counterpoise | 5:1 guide profile for the documented no-tuner starting point |
| 15–10 m | SS25, four 25 ft radials, tuner as required | SS17 at 12 ft, one 25 ft counterpoise | 5:1 guide profile for match and upper-band pattern control |
| 6 m | Separate controlled 4:1 test required | SS17 at 5 ft, one 25 ft counterpoise | Use the guide setting |
Bob’s 4:1 SWR curves are used as field-reference match evidence only. His exact radial geometry, transformer, coax, choke, soil and analyzer reference plane are not sufficiently documented to make those curves guaranteed Chameleon specifications.
The Return-Current System Is Part of the Antenna
RF current flowing into the vertical must return to the feed point. Chameleon offers several radial and counterpoise systems for this purpose: the supplied MPAS wire, CHA Counterpoise Kit, Counterpoise Extra Wires, DIY Radial/Counterpoise Kit, CHA FSR and the compact Stinger Kit. This lets the operator select for space, terrain, packed burden, deployment speed, visibility and repeatability.
More or longer radials do not automatically improve every band. Ground contact, insulation, conductor count, length, direction, feed-point height and coax routing change the current distribution. The correct comparison includes impedance, common-mode current, field strength, loss and pattern—not SWR alone.
Open the complete Rybakov Radial and Counterpoise Systems Guide.
General Deployment Procedure
- Select a clear site away from overhead power lines, vehicles, fences and public traffic.
- Identify the exact feed configuration. Do not stack the HYBRID, URT1, M-COIL and M25-COIL unless an official configuration explicitly requires it.
- Install the approved mount and confirm mechanical stability.
- Lay out the chosen radial or counterpoise system before extending the whip.
- Connect the return system only to the documented ground or counterpoise point.
- Connect the specified coax and position its choke according to the completed-system guide.
- Extend the whip carefully from the largest section upward and use approved guying where required.
- Measure the antenna at low power before transmitting.
- Tune only where required and within the current tuner and component limits.
- Record the band, geometry, radial system, soil condition and analyzer result so the deployment can be repeated.
What the Radiation Patterns Teach
Changing only an ideal 4:1 transformer, ideal 5:1 transformer or ideal feed-point tuner does not change the normalized radiation-pattern shape. The radiator, radial system, soil, feed-line current and installation geometry determine that shape. The feed system changes the impedance match and therefore how much transmitter power reaches the antenna after mismatch and network losses.
For this reason, the Chameleon comparison uses two views: a normalized NEC pattern that explains lobe shape and takeoff angle, and a realized-gain view that includes feed-system delivery. The URT1 curve is shown initially as a perfect-match, zero-loss upper bound; it is not measured tuner performance. Real transformer, tuner, coax and common-mode losses will be substituted as controlled measurements become available.
The first exploratory SS25/four-radial model shows progressively lower peak elevation from 80 through 12 metres, followed by higher upper lobes on 10 and 6 metres. This demonstrates an important operating lesson: a favourable SWR does not necessarily mean the strongest low-angle DX radiation.
Open all 18 band-by-band NEC pattern graphics and their model limitations.
Advantages
- One modular vertical platform supports several operating strategies.
- Good potential for low-angle vertical polarization and DX.
- Rapid portable deployment for POTA, SOTA, travel and emergency communications.
- Multiple Chameleon matching and return-system choices.
- URT1 option places the automatic match at the feed point.
- The dedicated 40-metre coil path is radiator-specific: M-COIL with SS17, or M25-COIL with SS25, without retaining the broadband transformer.
Limitations
- Performance depends strongly on the return system, ground and feed-line current.
- A tuner can create a match on an inefficient lower-band load.
- A 25-foot radiator remains electrically short on 80 metres.
- Upper-band patterns can develop lobes and nulls as the radiator becomes electrically long.
- The SS25 requires appropriate wind, guying and public-access controls.
- Radials consume space and can create trip hazards.
Common Myths
- “It tunes, therefore it is efficient.” False. Match and radiation efficiency are different measurements.
- “The transformer replaces the radials.” False. The antenna still needs a defined RF return path.
- “Every radial must be exactly one quarter wavelength.” False as a universal rule for ground-laid multiband portable systems.
- “Longer radials always perform better.” False. Their effect is frequency- and installation-dependent.
- “URT1 makes the radiator resonant.” False. It creates an impedance match at the feed point.
- “Leave the HYBRID installed with URT1, M-COIL or M25-COIL.” Not in the standard direct-feed configurations.
Safety and Stop-Transmitting Conditions
Never install any part of the antenna where it, a support, radial, guy line or falling component could contact a utility line. Establish an exclusion area around the vertical and radials. Stop transmitting immediately for arcing, smoke, hot connectors, unstable supports, an RF burn, unexpected equipment resets or rapidly changing SWR. Remove RF power before touching or adjusting the system.
Engineering and Validation Status
This workshop separates manufacturer-guide information, third-party field observations, NEC simulation, bench measurements and controlled field measurements. Published configuration relationships do not imply that every combination has equal gain, efficiency, bandwidth or power capability. Final Chameleon recommendations will be expanded as configuration-matched network, common-mode, pattern, loss, thermal and field-strength evidence is completed.
How This Reference Earns Trust
Every accepted graph and table will identify the complete antenna configuration, frequency, radiator and radial geometry, ground, feed-point height, matching network, tuner state, coax and choke path, measurement reference plane, evidence type and principal limitation. Normalized radiation-pattern shape will be separated from realized-gain and feed-system delivery. Releasable NEC models, run identifiers, CSV/JSON data, assumptions, revision history and corrections will be provided without distributing licensed solver material.
Negative results will remain visible. A configuration that is excellent for rapid multiband operation may not be the best 40-metre radiator; a tuner that creates an easy match may not create high efficiency; and an upper-band SWR minimum may coexist with an unfavourable elevation lobe. Explaining those distinctions is part of the product value.
Essential Questions
- Must the radial length change on every band?
- No. Tuned elevated radials are frequency-sensitive, but ground-laid multiradial systems can provide useful broadband service. Length, number, soil contact, placement and common-mode control must be considered together.
- Is 4:1 automatically better than 5:1?
- No. The actual impedance range, network loss, power handling, tuner location and complete deployment determine the better choice.
- Does URT1 make the radiator resonant?
- No. It creates a match at the feed point and reduces the length of coax operating at high SWR.
- Can the system operate on 80 metres?
- It may be matchable, but an SS25-class radiator is electrically short on 80 metres. Efficiency remains experimental until controlled loss and field evidence are complete.
- Does a successful DX contact prove efficiency?
- No. It demonstrates a radio link under the prevailing propagation, power, mode and noise conditions.
Relevant Chameleon Products
- CHA MPAS Lite
- CHA SS25
- CHA UNUN/BALUN
- CHA HYBRID-MINI
- CHA HYBRID-MICRO
- CHA URT1 and CHA URT1-MB
- CHA M-COIL for SS17
- CHA M25-COIL for SS25
- CHA Counterpoise Kit
- CHA DIY Radial/Counterpoise Kit
- CHA FSR
Source Note
This chapter is an independent Chameleon Knowledge Base synthesis based on the recovered mirror of IV3SBE’s historical page, a DARC technical workshop, ARRL vertical-antenna engineering guidance, current Chameleon product records, the MPAS Lite Operator’s Manual revision 7/21/2024 and the ongoing controlled Chameleon Rybakov engineering programme. Configuration-specific current manuals and component ratings govern operation.
Revision: Internal draft, 7 August 2026. Historical questions, model revisions, corrections and configuration-specific validation status will remain visible as the reference develops.
