Official pre-production preview
PRICE NOT YET ESTABLISHED
Final price and availability have not been announced. Sales and support cannot provide a quotation or estimate yet.
CHA F-LOOP 4.0 · Manually Tuned Portable Magnetic Loop
A compact 40–10 m magnetic loop engineered for QRP, HOA and highly portable operation where low weight, fast deployment and local-noise control matter.
Why Chameleon is building a new loop
The CHA F-LOOP 3.0 is not returning. Its large two-section aluminum radiator and supporting hardware produced a capable system, but also a package of approximately 4 lb.
The CHA F-LOOP 4.0 starts again around a smaller enclosure, an ABR coaxial radiator, a proprietary carbon-fiber support mast and a repeatable inductive coupling loop. The approved Prototype 6 system is approximately 2.6 lb—roughly 35% lighter than the former 4 lb system—while retaining manual tuning from 40 through 10 meters.
It is designed for the operator who needs a directional, high-Q antenna in an HOA, apartment, campsite or compact field position and understands the trade: a small loop saves space and can reject noise from selected directions, but it must be retuned as frequency changes and it cannot make a poor indoor RF environment disappear.
Prototype 6 reference
One controlled portable system
Operator decision support
QRP, HOA, apartment, travel and portable positions where footprint, weight and directional noise rejection matter.
Tuning enclosure with LED aid, 87 in radiator, coupling loop, telescopic mast, 12 ft choked feed line and fitted carry bag. Final contents remain subject to production validation.
The former 1 in two-section aluminum radiator or F-LOOP 3.0 structural accessories. The lighter 4.0 architecture does not inherit those load ratings.
Built-in tuning aid
The internal LED samples RF energy in the tuned circuit. At approximately 5 W, it begins to illuminate as the loop approaches resonance and becomes a fast visual aid while the operator turns the tuning control.
The LED is a resonance aid, not a calibrated SWR meter. Maximum brightness does not prove efficiency, radiation pattern or a safe installation.
Purpose-built signal path
The compact enclosure brings the manual tuning control, visual LED aid and field connections together as one purpose-designed assembly. Production construction details remain confidential while manufacturing engineering is completed.
The 87 in main radiator and 12 ft RG58 feed assembly are sourced through ABR Industries. The feed line incorporates an RFI choke, while the production connectors and cable lengths preserve a controlled, repeatable layout.
About ABR Industries →The 6 in red-anodized coupling loop is formed from 3/4 × 1/8 in aluminum bar. Together with the carbon-fiber telescopic mast and compact mounting enclosure, it forms one repeatable deployable system instead of leaving feed-loop geometry to field improvisation.
Measured prototype evidence
These RigExpert traces were measured on Prototype 6 indoors. They demonstrate that the manual capacitor and coupling arrangement can be adjusted to a low feed-point SWR on the sampled bands. Results will vary with location, nearby metal, building materials, feed-line routing and coupling geometry. A low indoor SWR does not prove efficiency or that transmitted energy is reaching outdoors effectively.
Reviewed NEC-4.2 pattern laboratory
Choose a band below to inspect the normalised upper-hemisphere elevation pattern and the closest available above-horizon direction cut. The controlled reference places the bottom of the 87-inch tuned main loop one loop diameter above average ground.
SIMULATION — NORMALISED PATTERN ONLY, LOSS-UNCORRELATED
Practical reading: a vertical small loop responds most strongly in its own plane and has reduced-response directions broadside to that plane. Real ground modifies the ideal free-space figure-eight, especially near the horizon, so a plotted reduction is not a guaranteed perfect field null. Rotate the complete antenna while receiving to minimise local noise, then retune at its final position.
Field safety
Follow the programme
Register for Chameleon Antenna email updates to receive verified F-LOOP 4.0 milestones, final specifications and availability information. This is not a preorder and does not reserve a unit.
No price has been established. Sales and support cannot provide an estimate yet. Registered operators will receive the official price when it is approved.
Development state: Approved functional prototype; production engineering and quotation in progress.
Manufacturing path: Production sourcing and enclosure engineering are in progress. Chameleon Antenna will perform final acceptance testing, packing and shipment.
Current target: December 2026, subject to manufacturing capacity, component supply, validation and final production approval. The release may occur earlier or later.
Prototype weights: tuning enclosure approximately 0.8 lb; coupling loop approximately 0.31 lb; telescopic carbon-fiber mast approximately 0.31 lb; complete system approximately 2.6 lb.
Production boundary: photographs show Prototype 6. Enclosure finish, controls, fittings, mounting threads, cable details, carry bag and other production elements may change.
1. Easy returns
If you are not completely satisfied with your purchase, you may return it within 30 days, subject to a 20% restocking fee. Please note that international orders and items marked as Final Sale are not eligible for returns.
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When will my order ship?
We ship everything from our Ventura Headquarters within 1-2 business days (except weekends, holidays and when the surf is good).
Do you ship internationally?
We sure do. Please note that international orders take significantly longer for delivery and may be subject to import/value-added taxes that are beyond our control.
How do I contact someone?
Customer service hours are Monday - Friday: 9am - 5pm PST. Please allow up to 1-2 days for someone to get back to you. We can be reached by phone at 888-628-9020 and by email here Customer Service
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