Brand: Gabil

Mobile HF antennas often get blamed for high SWR, but the real bottleneck is frequently the vehicle ground and RF return path. YAESU itself notes that a solid bond to the car body is important for establishing a counterpoise, and some mounting situations may not allow low SWR easily. That is exactly where GRA-MAT50 helps. Instead of pretending to be a magic patch, it works by improving ground coupling and giving RF current a more controlled return path. The result is a more stable antenna system, easier tuning, and lower SWR in mobile HF operation. This matters even more on lower bands. Real world ATAS 120A user reports show 40 meter operation is where installation quality and grounding become especially important. In one shared case, increasing the number of magnetic ground sheets improved 40m SWR from about 1.8 to 1.4. Another operator found that placing the antenna closer to a usable ground reference improved SWR on 7 MHz noticeably. GRA-MAT50 is designed for 7 to 50MHz operation. For 3.5MHz, using 2 sets provides a larger effective coupling area and a stronger ground enhancement effect. It is a simple upgrade for mobile screwdriver antennas, ATAS style antennas, and other HF mobile systems where better grounding can make the difference between frustrating tuning and a usable setup. Specifications Usable frequency range: 7 to 50MHz Using 2 sets can reach the 3.5MHz band Power handling: 500W SSB, 200W FM / CW Heat resistance: minus 20 degrees C to 90 degrees C Adhesion: below 110 km/h, no wind Dimensions: 80 x 195 mm, sheet body Wire length: about 30 cm Weight: about 55 g, including wires and terminals Material: adhesive resin magnet with copper sheet Made in Taiwan

• Made for the real problem in mobile HF Many mobile HF antennas tune the whip, but the vehicle still lacks an ideal RF return path. GRA MAT50 helps improve ground coupling, so tuning becomes more stable and SWR is easier to bring down, especially where vehicle mounting conditions are not ideal.
• Designed for 40 meter pain points User reports around ATAS 120A repeatedly show that lower HF bands are more sensitive to grounding and counterpoise quality. GRA MAT50 is built to help mobile operators on 40 meters and above create a more effective ground reference without complicated radial systems.
• One mat for 7 to 50MHz, two mats for stronger low band support Usable frequency range is 7 to 50MHz. For 3.5MHz operation, using 2 sets increases the effective coupling area and helps improve low band performance where a single small ground surface is often not enough.
• A practical upgrade for automatic tuning antennas If you use antennas like ATAS style motorized tuning antennas, you already know the whip can move but the ground does not fix itself. GRA MAT50 gives your setup a better foundation, helping the antenna system behave more like it should.
• Compact, durable, and made in Taiwan Supports 500W SSB and 200W FM or CW, with heat resistance from minus 20 degrees C to 90 degrees C. Sheet body size is 80 x 195 mm, wire length is about 30 cm, and total weight is about 55 g including wires and terminals.

Model: GRA-MAT50
Color: black