LDG AT-100 Pro II Automatic Antenna Tuner 1.8–54 MHz, 125W

The LDG AT-100 Pro II is a high-performance automatic HF antenna tuner covering 1.8–54 MHz (including 6m). It handles 1–125W SSB/CW (100W on 6m, 50W FM/digital), making it a solid choice for base station and semi-professional amateur radio setups.

The standout feature is the dual antenna switch — two antenna inputs with independent memory banks, so you can flip between antenna systems instantly without retuning. LDG's 4,200+ frequency memory system recalls previous settings in ~0.2 seconds, keeping band changes fast and efficient. A built-in LED bar graph displays SWR, RF power, and tuner status at a glance.

Note: When used with radios such as the IC-7300, FTDX10, or TS-890 in bypass mode, the tuner will pass 70 MHz with minimal loss but will not actively tune on that frequency.

Key Features

• Frequency range: 1.8–54 MHz (HF + 6m)
• Power: 1–125W SSB/CW, 100W on 6m, 50W FM/digital
• Impedance matching: 6–1,000Ω (HF), 16–150Ω (6m)
• Dual antenna switch with independent memory banks per output
• 4,200+ frequency memories — ~0.2s recall, 0.5–6s full tune
• LED bar graph: SWR, RF power, and status
• Auto and semi-auto tuning modes
• Supports coax-fed antennas; long wire/ladder-line with optional balun

Ideal For

• Multi-antenna base station setups
• DX and contest operators
• Multi-band HF antenna systems
• Upgrading from internal radio tuners