Chameleon Antenna M25 40M Loading Coil

CHA M25-Coil – 40M Loading Coil for SS25 Vertical

Unlock the Power of 40 Meters with Your Basic Vertical (BV) Setup

The CHA M25-Coil is a rugged, high-performance 40-meter loading coil designed to dramatically expand the frequency coverage of your vertical antenna system. It’s the perfect companion for the CHA SS25 25-foot telescoping whip and seamlessly integrates with your MPAS-ready Basic Vertical configuration to create a resonant, quarter-wave, base-loaded vertical antenna on 40 meters.

Built with serious operators in mind, this coil brings simplicity and performance together—whether you're in the field, on a deployment, or operating under HOA restrictions.

Key Highlights

• Enables 40M Operation: Add the critical 40-meter band to your vertical antenna setup without changing your configuration.
• Bypass Feature: Switch instantly to 30–6M operation with a jumper (jumper not included)—no need to remove the coil.
• Purpose-Built for SS25: Optimized for the CHA SS25 25' telescopic whip for perfect matching and performance.
• MPAS-Ready: Fully compatible with Chameleon Antenna’s Modular Portable Antenna System (MPAS).
• Quick Deployment: Simple, tool-free installation ideal for portable, base, or emergency setups.

Durable and Compact: Built in Nevada, USA for field-grade reliability.

Ideal For

• POTA & SOTA Activators: Take full advantage of the 40M band during Parks on the Air or Summits on the Air activations.
• Emergency Communicators: Ensure reliable 40M coverage in tactical and disaster response operations.
• HOA-Constrained Operators: Add 40M capability to your stealth vertical setup in restricted environments.
• Preppers & Field Operators: Rugged, portable, and versatile—ideal for bug-out bags, go-kits, and mobile operations.
• Amateur Radio Enthusiasts: Upgrade your vertical system for better reach and resonance on a powerful HF band.

Power Considerations for Safe Use

• SSB Mode: Up to 200W for voice communication, which is beneficial for clear, powerful transmissions on lower HF bands.
• CW Mode: Up to 100W, suitable for modes requiring continuous or digital signal transmission. Monitor SWR and reduce power slightly in extreme heat or for extended operation.

Tips for Optimal Performance

• Radials: Always use radials appropriate for the frequency. More and longer radials improve grounding, especially important on 40 meters.
• Environment: Changes in terrain, moisture, and nearby objects may affect tuning. Periodic checks and adjustments can ensure the best SWR.
• Safety: Keep the setup away from people and RF-sensitive equipment, especially when operating above 10 watts.

This versatile setup enables efficient communication across multiple HF bands, whether for emergency, recreational, or portable operations, making the CHA M-COIL a valuable tool in field-deployable antenna configurations.

Made in Nevada, USA | Built to Perform – Wherever You Go

The CHA M25-COIL consists of:

1 X CHA M25-COIL