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CHA B3D (Broadband Base Dipole)
CHA B3D (Broadband Base Dipole)
CHA B3D (Broadband Base Dipole)
CHA B3D (Broadband Base Dipole)

Chameleon Antenna

CHA B3D (Broadband Base Dipole)

Sale price $192.00

LENGTH

91 in stock

Overall rating: 4.75 / 5 from 4 reviews.

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Reviews

Perfect for a small HOA Lot

"When I saw the diagram for this antenna, it was just the right fit for my lot. I have tall trees at the back of my lot for the center support and a 6-foot privacy fence to support each leg. It works much better than the EFHW I was using. I've had about 100 Qs with it in just over a week and am so far very pleased. The green wire blends very well with the trees, making it almost invisible. I have the 60-foot option and also purchased the 100-foot coax with built-in choke. The quality of the materials exceeded my expectations. I do recommend this antenna if you have a small lot and need something that will not attract attention in an HOA. Can you spot the antenna in the photos?"

— Bill I. (5/5)

BD3 Dipole

"So far this dipole has been great to me! As always, high quality build with high quality materials. Looking forward to many QSOs with it. A++!"

— Roberto R. (4/5)

CHA B3D

"12 resonant bands with SWR of 1. 1 to 1. 9"

— Glenn B. (5/5)

great idea

"great Antenna. Will be using on my roof to hide from HOA. Like the idea of a true dipole that is broadbank"

— Kenneth C. (5/5)

Q&A

Broadband HF center-fed dipole

One clean installation. Wide HF coverage.

One broadband HF dipole. Three lengths.

The CHA B3D is a rugged, center-fed broadband HF dipole for operators who want wide frequency coverage without installing a complicated multiband wire array.

Choose the 60-foot model for smaller lots, HOA environments, and portable operation, or choose the 120- or 146-foot model when space allows and 160-meter capability matters. Install it as an inverted V from one elevated center support or as a horizontal dipole. An appropriate antenna tuner is required on most frequencies.

  • HF coverage80-6 m or 160-6 m, model dependent
  • Three spans60, 120, or 146 ft
  • Two deploymentsInverted V or horizontal dipole
  • Power100 W SSB / 50 W CW / 25 W other modes

Choose the footprint that fits the station

Choose your B3D

All three models use the same straightforward balanced-dipole architecture. The difference is the wire length and the resulting documented frequency coverage.

CHA B3D 60'

Two 30 ft wire legs 3.5-54 MHz continuous

For smaller lots, HOA installations, and portable operation where a shorter span matters.

Select this model

CHA B3D 120'

Two 60 ft wire legs 1.8-54 MHz continuous

For base stations with enough space for a full 120 ft dipole and lower-band operation.

Select this model

CHA B3D 146'

Two 73 ft wire legs 1.8-54 MHz continuous

The longest B3D option for stations that can accommodate the complete 146 ft span.

Select this model

Tuning: An antenna tuner is required on most frequencies for every B3D model.

See the complete installation

One elevated center support is enough

The inverted-V configuration lets the B3D operate from one elevated center support while the two wire legs slope toward lower end supports. When three suitable supports are available, deploy the same antenna as a horizontal dipole.

  • Inverted V: one elevated center support plus two lower end supports.
  • Horizontal dipole: elevated center and end supports.
  • Fully extend both equal wire legs in opposite directions and leave some sag.
  • Keep the antenna and every support safely away from power lines.
B3D inverted-V installation with the matching transformer elevated from a tree and the two equal wire legs sloping to lower supports
Official B3D guide: typical inverted-V home-station installation, not to scale.

Why choose the B3D?

Wide coverage without a complicated wire array

Broadband operation

Move across multiple HF bands without links, traps, or repeated physical reconfiguration. Use an appropriate tuner to match the installed antenna.

Three property-friendly lengths

Balance available space against frequency coverage instead of forcing one wire length onto every station.

Simple support plan

An inverted V needs only one elevated center support, making the B3D practical where a full horizontal span is difficult.

Base or portable use

The B3D is designed for base-station service, while the 60 ft model can also be organized for portable deployment with suitable supports and optional winders.

Know what arrives

Included and customer-supplied equipment

Included

  • B3D matching transformer
  • Two equal antenna-wire assemblies for the selected model
  • Permanently attached isolation rings
  • Wire connectors
  • Carabiner
  • Matching-transformer eyebolt

Customer supplies

  • Suitable center and end supports
  • Paracord for suspending the center and wire ends
  • Compatible 50-ohm coaxial feed line
  • Appropriate antenna tuner
  • Weatherproofing material for a permanent outdoor connection
Labeled B3D matching transformer, antenna wire, isolation rings, carabiner, wire connector, coax socket, and eyebolt
Official B3D component identification. Paracord is not pictured and is not supplied.

Complete product reference

B3D specifications

Product type
Balanced broadband center-fed HF dipole
Supported installations
Inverted V or horizontal dipole
B3D 60 frequency range
3.5-54.0 MHz continuous, including 80 through 6 meters
B3D 120 and 146 frequency range
1.8-54.0 MHz continuous, including 160 through 6 meters
Tuning
An antenna tuner is required on most frequencies
Typical SWR
4:1 or less; frequency, wire length, configuration, height, and site dependent
Power - SSB phone
100 W maximum, ICAS
Power - CW
50 W maximum, ICAS
Power - digital, RTTY, AM, FM, and other modes
25 W maximum, ICAS
Antenna-side coax connection
SO-239 socket on the matching transformer
B3D 60 dimensions
60 ft maximum total span; two 30 ft wire legs
B3D 120 dimensions
120 ft maximum total span; two 60 ft wire legs
B3D 146 dimensions
146 ft maximum total span; two 73 ft wire legs
Wire construction
16-gauge tinned-copper Kevlar-reinforced PTFE insulated wire
Installation tension
Fully extend both wire legs with some sag; do not pull them taut
Permanent installation
Weather-seal the coupled coax connectors against water intrusion

Operating limit: Prolonged transmissions or power above the published limits can damage antenna components.

Published guide measurements

Compare the three B3D SWR references

These guide plots demonstrate the broadband character of each model. Installed SWR changes with frequency, height, geometry, surroundings, feed line, and location; verify the completed antenna with an analyzer and tuner.

Published B3D 60 SWR reference plot
B3D 60 Open full size
Published B3D 120 SWR reference plot
B3D 120 Open full size
Published B3D 146 SWR reference plot
B3D 146 Open full size

Documented additions

Support, analyze, tune, or service the antenna

  • CHA CFM 34 HD: portable carbon-fiber mast documented for erecting inverted-V antennas such as the B3D.
  • CHA SA-1: compact SWR analyzer for checking the installed antenna.
  • CHA URT-1: remote outdoor antenna tuner.
  • CHA EXTRA WIRE: replacement or alternate-length wire; two equal EMCOMM SERIES wires are required to form the dipole.
  • CHA coax with integrated RFI choke: documented in 50, 75, and 100 ft lengths, with the choke installed at the antenna.

Availability and the exact selected product option still control what can be purchased.

Coverage & Pattern

See how the documented B3D installations radiate

Open the reviewed 2D and interactive 3D patterns for the exact modeled B3D configurations.

View B3D Coverage & Patterns
Check B3D compatibility

Triple Guarantee

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.

2. Safe with us

Our website is 100% verified and all transaction and customer info is securely encrypted with the latest technology.

3. Have a question?

We have an awesome customer service team who lives and breathes this stuff:

ANTENNA TECH SUPPORT ONLY:

  • INQUIRY@CHAMELEONANTENNA.COM

PENDING ORDER INQUIRIES ONLY:

  • ORDERS@CHAMELEONANTENNA.COM


MILITARY INQUIRIES:

  • INQUIRY@CHAMELEONANTENNA.COM
  • 775-742-5165

BUSINESS INQUIRIES:

  • SUPPORT@CHAMELEONANTENNA.COM

Frequently asked

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