Chameleon M-Coil

The Chameleon Antenna M-COIL is a high-quality inductive loading coil rated for 100W CW and 200W SSB, making it ideal for portable ham radio setups, field operations, and emergency communications. Designed to enhance vertical whip antennas, the M-COIL allows efficient operation on lower HF bands, such as 30 meters, 40 meters, and potentially 60 meters, without requiring full-length antennas.

These power ratings ensure stable, reliable performance while minimizing the risk of coil overheating or performance degradation—especially during long CW or SSB transmission sessions.

Using the CHA M-COIL with Chameleon Whips

Chameleon SS58 (1.5m / 58 inches)

• Best Bands: 20 and 30 meters (with M-COIL)
• Setup: Attach the M-COIL between the Blank Adapter and the SS58 whip. The M-COIL compensates for the whip’s shorter length, enabling resonance on lower frequencies.
• Applications: Perfect for compact HF setups, portable ops, or HOA-restricted installations where antenna height is limited.

Chameleon SS17 (5.2m / 17 feet)

• Best Bands: 30 and 40 meters (with M-COIL); covers 20 to 6 meters without the coil
• Setup: Extend to 16 feet for 40 meters with the M-COIL. For 30 meters, adjust the whip to approximately 7’5”.
• Applications: Offers an excellent balance between portability and low-band coverage, ideal for POTA/SOTA activations, field day setups, or go-kits.

Chameleon SS25 (7.6m / 25 feet)

• Best Bands: 40 meters and potentially 60 meters (with M-COIL); 20 meters (without coil)
• Setup: Fully extend the SS25 whip when using the M-COIL for 40m. For 60m, tune the whip and radials accordingly.
• Applications: Delivers high-efficiency HF performance for serious field operators, offering excellent range and signal strength on low bands.

⚠️ Power Guidelines for Safe Use

• SSB (Voice): Up to 200W, ideal for clear, powerful voice communications on HF.
• CW (Continuous/Digital): Up to 100W. Monitor SWR, and reduce power in hot conditions or during extended operation to protect the coil.

📈 Tips for Optimal HF Antenna Performance

• Use Quality Radials: Deploy radials suitable for the intended band. Longer and more radials improve grounding and signal performance, especially on 30m and 40m.
• Adapt to Environment: Antenna tuning can be affected by nearby structures, soil moisture, and terrain. Always check and adjust SWR for best results.
• Safety First: Keep antennas and M-COIL setups clear of people and RF-sensitive electronics, especially when operating over 10W.

🎯 Why Choose the CHA M-COIL?

This versatile loading coil adds critical low-band functionality to your portable HF antenna system, offering modularity, compact deployment, and band flexibility. Whether you’re operating in the field, on a summit, or from a small backyard, the Chameleon M-COIL helps you reach further with reliable, efficient HF communication.