--- product_id: 537136692 title: "GRA MAT50 HF Ground Enhancement Mat for Mobile Screwdriver Antennas, Improves SWR and Ground Coupling for 7 to 50MHz, Dual Pack Support for 3.5MHz" brand: "gabil" price: "VT10823" currency: VUV in_stock: true reviews_count: 12 category: "Gabil" url: https://www.desertcart.vu/products/537136692-gra-mat50-hf-ground-enhancement-mat-for-mobile-screwdriver-antennas store_origin: VU region: Vanuatu --- # Handles 500W power 7-50MHz wide freq. Magnetic ground plane GRA MAT50 HF Ground Enhancement Mat for Mobile Screwdriver Antennas, Improves SWR and Ground Coupling for 7 to 50MHz, Dual Pack Support for 3.5MHz **Brand:** gabil **Price:** VT10823 **Availability:** ✅ In Stock ## Summary > 🧲 Elevate your mobile HF game—ground like a pro, signal like a legend! ## Quick Answers - **What is this?** GRA MAT50 HF Ground Enhancement Mat for Mobile Screwdriver Antennas, Improves SWR and Ground Coupling for 7 to 50MHz, Dual Pack Support for 3.5MHz by gabil - **How much does it cost?** VT10823 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/537136692-gra-mat50-hf-ground-enhancement-mat-for-mobile-screwdriver-antennas) ## Best For - gabil enthusiasts ## Why This Product - Trusted gabil brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Endure:** Rugged construction supports up to 500W SSB and operates reliably from -20°C to 90°C. - • **Slash SWR & Noise:** Provides a controlled current return path to reduce SWR and minimize RF interference. - • **Portable & User-Friendly:** Magnetic design sticks securely to vehicles or field setups—easy install, effortless mobility. - • **Versatile Frequency Range:** Covers 7 to 50MHz, extendable to 3.5MHz with dual units for ultimate band flexibility. - • **Optimize Your Signal Strength:** Enhances grounding to stabilize antenna tuning for crystal-clear transmission. ## Overview The GRA-MAT50 HF Antenna Ground Mat is a magnetic ground plane enhancer designed for portable and mobile ham radio use. Operating across 7 to 50MHz (extendable to 3.5MHz with two units), it improves antenna efficiency by stabilizing tuning and reducing SWR and RF noise. Its durable design supports up to 500W power and withstands extreme temperatures, making it ideal for POTA, vehicle, and field operations. ## Description Product description The whip tunes, but the vehicle may not Automatic tuning antennas can adjust frequency, but they cannot fix poor grounding. In mobile HF setups, the real limitation is often the lack of a stable RF return path. GRA-MAT50 helps improve ground coupling so your antenna system can tune more easily and perform more consistently. Why 40 meters is often the trouble band Lower HF bands such as 40 meters require a larger effective ground to work properly. When the ground is insufficient, tuning becomes unstable and SWR tends to rise. GRA-MAT50 increases effective ground coupling, helping improve performance where it matters most. Improve current flow, not just SWR GRA-MAT50 is not a reflector. It improves the RF current return path by enhancing capacitive coupling with nearby conductive surfaces. By stabilizing current flow, the antenna system becomes easier to tune and performs closer to its intended design. Built for real mobile HF operation Designed for real-world conditions, GRA-MAT50 supports up to 500W SSB and operates reliably from -20°C to 90°C. Its flexible magnetic structure allows quick attachment to metal surfaces, making it ideal for mobile, portable, and field use. An HF antenna is not just the radiator. It also needs a proper return path to function correctly. GRA-MAT50 helps complete the system by improving ground coupling, making your antenna work the way it should. Specification Review: PORTABLE - EASY TO USE - INEXPENSIVE - Quite functional, works well to adjust a mobile antenna's ground plain and general experimentation. The magnetic pad sticks well to my car for good contact. It's easy to install and remove so it's portable. I've used mine for weeks now and I must say that I have seen changes in signal strength based on frequency and antenna. Do your research first. Review: Improved my SWR - I use the GRA-MAT50 MK2 with my Yaesu ATAS-120A antenna on a mag mount in the center of my minivan roof. Before connecting the GRA-MAT50 to the antenna, my SWR on 40 meters was about 2.3:1, which is not terrible, but could be better. Once I connected the GRA-MAT50 to the antenna, my SWR on 40 meters went down to about 1.4:1, which is pretty good. I did not notice any improvement in SWR on other bands (10,12,15,17,and 20 meters) because the Yaesu ATAS-120A is able to tune those bands good on its own without the GRA-MAT50. But the improvement on 40 meters makes this purchase worth it. A friend of mine also uses the Yaesu ATAS-120A on a mag mount and he has the same higher SWR problem on 40 meters. So he is considering the purchase of the GRA-MAT50 to help with 40 meter SWR. Even though the GRA-MAT50 did not make a difference on bands other than 40 meters with my Yaesu ATAS-120A, it might help with my transmit signal somewhat anyway by creating a more efficient counterpoise by helping to increase the capacitive coupling of the antenna to the vehicle.. I have another mag mount antenna, (Hustler MO-2 with resonators) but I have not tested the GRA-MAT50 with that antenna. If I do test it with that antenna, I will submit that review. I would think that the GRA-MAT50 may probably help with that antenna too since the bandwidth with the Hustler MO-2 on a mag mount is quite narrow on 40 meters, and the internal tuner of the radio is not able to get the SWR real low on 40 meters. So, what is generally known about a mag mount antenna on the HF bands, the lower in frequency that you get, the less effective a mag mount antenna can be, most notably 7 mHz or lower. But the GRA-MAT50 can help with that. Bottom line, I recommend the GRA-MAT50, especially for 40 meters. ## Features - 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. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BVTJT1RJ | | Antenna | Radio | | AntennaDescription | Radio | | Best Sellers Rank | #361 in Radio Antennas | | Brand | Gabil | | Color | black | | Customer Reviews | 4.1 out of 5 stars 52 Reviews | | Impedance | 50 Ohms | | Manufacturer | G GABIL RADIO TAIWAN 2006 | | Model Number | GRA-MAT50 | | Number of Channels | 1 | | Number of Items | 1 | | UPC | 631851845818 | | Unit Count | 1.0 Count | | Warranty Description | non | ## Product Details - **Antenna:** Radio - **Brand:** Gabil - **Color:** black - **Impedance:** 50 Ohms - **Manufacturer:** G GABIL RADIO TAIWAN 2006 - **Number of Channels:** 1 - **Number of Items:** 1 - **UPC:** 631851845818 ## Images ![GRA MAT50 HF Ground Enhancement Mat for Mobile Screwdriver Antennas, Improves SWR and Ground Coupling for 7 to 50MHz, Dual Pack Support for 3.5MHz - Image 1](https://m.media-amazon.com/images/I/41xngsKMKvL.jpg) ![GRA MAT50 HF Ground Enhancement Mat for Mobile Screwdriver Antennas, Improves SWR and Ground Coupling for 7 to 50MHz, Dual Pack Support for 3.5MHz - Image 2](https://m.media-amazon.com/images/I/41ywhj0AXxL.jpg) ![GRA MAT50 HF Ground Enhancement Mat for Mobile Screwdriver Antennas, Improves SWR and Ground Coupling for 7 to 50MHz, Dual Pack Support for 3.5MHz - Image 3](https://m.media-amazon.com/images/I/51lIkTPwp7L.jpg) ![GRA MAT50 HF Ground Enhancement Mat for Mobile Screwdriver Antennas, Improves SWR and Ground Coupling for 7 to 50MHz, Dual Pack Support for 3.5MHz - Image 4](https://m.media-amazon.com/images/I/61n8YX8c2sL.jpg) ![GRA MAT50 HF Ground Enhancement Mat for Mobile Screwdriver Antennas, Improves SWR and Ground Coupling for 7 to 50MHz, Dual Pack Support for 3.5MHz - Image 5](https://m.media-amazon.com/images/I/51ku5VFYl+L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ PORTABLE - EASY TO USE - INEXPENSIVE *by B***F on May 20, 2025* Quite functional, works well to adjust a mobile antenna's ground plain and general experimentation. The magnetic pad sticks well to my car for good contact. It's easy to install and remove so it's portable. I've used mine for weeks now and I must say that I have seen changes in signal strength based on frequency and antenna. Do your research first. ### ⭐⭐⭐⭐⭐ Improved my SWR *by E***D on February 1, 2025* I use the GRA-MAT50 MK2 with my Yaesu ATAS-120A antenna on a mag mount in the center of my minivan roof. Before connecting the GRA-MAT50 to the antenna, my SWR on 40 meters was about 2.3:1, which is not terrible, but could be better. Once I connected the GRA-MAT50 to the antenna, my SWR on 40 meters went down to about 1.4:1, which is pretty good. I did not notice any improvement in SWR on other bands (10,12,15,17,and 20 meters) because the Yaesu ATAS-120A is able to tune those bands good on its own without the GRA-MAT50. But the improvement on 40 meters makes this purchase worth it. A friend of mine also uses the Yaesu ATAS-120A on a mag mount and he has the same higher SWR problem on 40 meters. So he is considering the purchase of the GRA-MAT50 to help with 40 meter SWR. Even though the GRA-MAT50 did not make a difference on bands other than 40 meters with my Yaesu ATAS-120A, it might help with my transmit signal somewhat anyway by creating a more efficient counterpoise by helping to increase the capacitive coupling of the antenna to the vehicle.. I have another mag mount antenna, (Hustler MO-2 with resonators) but I have not tested the GRA-MAT50 with that antenna. If I do test it with that antenna, I will submit that review. I would think that the GRA-MAT50 may probably help with that antenna too since the bandwidth with the Hustler MO-2 on a mag mount is quite narrow on 40 meters, and the internal tuner of the radio is not able to get the SWR real low on 40 meters. So, what is generally known about a mag mount antenna on the HF bands, the lower in frequency that you get, the less effective a mag mount antenna can be, most notably 7 mHz or lower. But the GRA-MAT50 can help with that. Bottom line, I recommend the GRA-MAT50, especially for 40 meters. ### ⭐⭐⭐ On the fence *by R***Y on December 23, 2024* I picked up the GRA-MAT50 MK2 Counterpoise Magnet Mat to pair with my magnetic mount and HF antenna, and I’m left with mixed feelings. On the positive side, it’s a clever concept with an interesting form factor that magnetically attaches to the car, making it super easy to use. However, I’m not convinced it actually improves performance, at least on HF frequencies—it just doesn’t seem to make a noticeable difference. Perhaps it might have more impact on VHF or UHF, but for HF use, I’m not seeing much value. While it’s a cute and innovative idea, I can’t justify giving it more than a 3 out of 5. ## Frequently Bought Together - GRA-MAT50 MK2 Counterpoise Magnet Mat Ground Plane for Magnetic Mount & HF Antenna - Ring Terminals for GRA-ULT01 Tripod Radial Elements Item - GRA-ULT01 Tripod Accessory: Quick-Release Thumbscrews and Ground Plane Wire Ring Terminals for Enhanced Antenna Support --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/537136692-gra-mat50-hf-ground-enhancement-mat-for-mobile-screwdriver-antennas](https://www.desertcart.vu/products/537136692-gra-mat50-hf-ground-enhancement-mat-for-mobile-screwdriver-antennas) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-06-03*