Vine Antennas RST-LAM1

7 / 14 / 21 / 28 MHz Portable HF GP Antenna
50W–100W | Telescopic | Outdoor / Field Use | Ideal for QRP & Portable Ops

The Vine Antennas RST-LAM1 is a compact, lightweight, and highly versatile shortened sensing GP antenna designed for HF operators who need reliable performance in the field. Perfect for radios such as the Xiegu G90, Icom IC-705, X5105, and other portable transceivers, this antenna offers fast setup, colour-coded coils, and excellent tuning flexibility across four key HF bands.

🔧 Key Specifications

• 📡 Type: Shortened sensing GP (Ground-Plane) antenna

• 🎯 Bands Supported:

  • 7 MHz (Blue coil)

  • 14 MHz (Red coil)

  • 21 MHz (Green coil)

  • 28 MHz (Yellow coil)

• 🔀 Coils:

  • Single matching coil + One sensing coil per band

• ⚙️ Interface: M6 coil & vibrator connection

• 🔌 Power Handling:

  • 7 MHz: Up to 50W

  • 14 / 21 / 28 MHz: Up to 100W

• 📏 Total Length: ~1.4 m (with 7 MHz coil fitted)

• ⚖️ Weight: 320 g

• 🎨 Colour Options:

  • Black kit

  • Colour coil kit (Blue / Red / Green / Yellow)

• 📦 Box Size: 180 × 110 × 30 mm

• 🌍 Origin: Mainland China

• 🆔 Model: Vine Antennas RST-LAM1

📦 What’s Included

• 1 × Base unit (SO-239)

• 4 × Coils (7 / 14 / 21 / 28 MHz)

• 1 × Telescopic whip antenna

• 1 × 4–16 terminal block

• 1 × 4–10 terminal block
  (Used for ground network or vehicle-body grounding)

🛠️ How to Use the RST-LAM1

1️⃣ Attach the Telescopic Whip

Connect the pull-rod (whip) antenna to the base’s wire ring.

2️⃣ Extend the Whip Fully

Pull the rod out completely, then shorten slightly as needed for fine-tuning.

3️⃣ Use Ground Radials for Field Operation

For best performance, connect 1–3 radial wires, each around 3 m long.

• For 7 MHz, 3 radials are recommended.

• Wire sizes: 1.5 mm² or 2.5 mm².

4️⃣ Vehicle Use

If mounting on a vehicle:

• Ensure solid body grounding

• Use 4 mm² or thicker copper braid.

5️⃣ Grounding is Essential

The ground radial system is a critical part of GP antenna performance—especially with shortened designs.

6️⃣ Use an SWR Meter or Analyzer

Recommended for optimal tuning and identifying the “resonance point”.

🏗️ Installation Options

The SO-239 base allows multiple mounting methods:

• Magnetic suction cup base

• Clip-edge / bracket mounts

• Standard SO-239 ground-plane mounts

👉 Note: Regardless of mounting style, ground radials are required for correct operation.

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