Chameleon Antenna M25 40M Loading Coils

Chameleon Antenna M25 40M Loading Coils allow you to unlock the power of 40 meters. The M25-Coil, a rugged, high-performance loading coil designed to dramatically expand the frequency coverage of your vertical antenna system. Purpose-built for use with the CHA SS25 25-foot telescoping whip, this coil transforms your MPAS-ready Basic Vertical setup into a resonant, quarter-wave, base-loaded vertical antenna for 40 meters. Whether you're operating in the field, responding to emergencies, or working within HOA restrictions, the M25-Coil delivers reliable performance with quick, tool-free installation. A built-in bypass feature allows you to instantly switch to 30–6M operation using a jumper (not included), eliminating the need to remove the coil. Compact and durable, the M25-Coil is proudly built in Nevada, USA, and is ideal for POTA/SOTA activators, emergency communicators, and amateur radio operators seeking a portable, stealth-friendly solution for 40M operation.

Key Features:

• Enables 40M Operation: Adds the critical 40-meter band to your vertical antenna setup without requiring a full reconfiguration.

• Quick Bypass Functionality: Instantly switch to 30–6M operation with a simple jumper for seamless multi-band use.

• Optimized for CHA SS25 Whip: Designed specifically for the 25' telescoping whip and fully compatible with Chameleon’s MPAS system.

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.