Description
The JNCRADIO JMAT-50 Counterpoise Magnet Mat is a compact and portable magnetic ground plane designed to dramatically improve mobile HF antenna performance. By magnetically coupling to your vehicle’s metal body, it acts as a portable counterpoise, boosting radiation efficiency and reducing SWR for clearer, more reliable communication. Operating from 7 to 50 MHz, it also supports 3.5 MHz (80 m band) when used with two or more mats to increase ground area and ensure proper tuning.
It offers wideband coverage from 7 MHz to 50 MHz, enabling reliable mobile HF operation across multiple bands—and with two mats combined, even supporting 3.5 MHz for extended low-band performance.
The replaceable lead design allows flexible installation and easy maintenance; when operating on the 50 MHz band, keep the lead within 20 cm to ensure proper tuning and avoid excessive reactance or elevated SWR.
Its full-metal cloth coverage with a protective film laminate ensures durability, strong magnetic coupling, and consistent ground performance in demanding mobile environments.
Built for the road — the JMAT-50 delivers dependable performance and enhanced signal quality for mobile HF operators everywhere.
Specification
| Frequency Range | 7 MHz – 50 MHz (expandable to 3.5 MHz when using two units) |
| Max Power Handling | 500 W (SSB) / 200 W (CW/FM) |
| Mat Dimensions | 21*10cm |
| Weight | 200g |
| Standard Lead Length | Approx. 30 cm (recommended ≤ 20 cm when used at 50 MHz) |
| Connection Type | Strong magnetic base + dual terminal holes |
| Terminal Hole Sizes | Large hole : 16 mm; Small hole : 5 mm — compatible with common antenna ground terminals |
| Surface Material | Fully covered with metallic fabric for enhanced coupling and durability |
| Adhesion Strength | Remains securely attached to flat metal surfaces at speeds up to 120 km/h |
| Operating Temperature | -20 °C to +90 °C — suitable for various outdoor environments |
| Recommended Use | For high frequencies (e.g. 50 MHz), keep lead length ≤ 20 cm to prevent tuning failure |
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