ICOM AT-140 Automatic Antenna Tuner


Automatic antenna tuner, MFG# AT-140, Matches the transceiver to a long wire or whip antenna with little insertion loss. Cable connections are easy to install.

For M700PRO, M710, M802 and M803.

In Stock | Ready to Ship

GAM/McKim HF-SSB Split Lead Antenna for Sailboats

The GAM/McKim split lead single side band antenna is a favorite amongst sail boaters because it eliminates the need for backstay insulators forever. The split lead antenna simply press fits onto your existing backstay wire with no special tools or equipment required. The GAM/McKim is secured at the base by a hard grade plastic T clamp and requires a back stay length of at least 34 feet.

Communications Expert Gordon West Reports, “I have done numerous SSB ham and marine radio checks with this system and have found no discernible signal losses, even when used with a well-grounded backstay aboard a steel-hulled vessel.” The Split Lead antenna’s. . .”twin radiating elements. . .bang out a signal as if they were suspended in mid-air.” – from Sail Magazine’s “Ask Sail” column, October 2005.

Click here to download a PDF of product features.
The split lead antenna installation requires no alteration of the backstay thus preserving full mechanical integrity of the backstay wire. All RF elements of the antenna are fully insulated eliminating the possibility of the shock hazard posed by the bare wire connection in conventional backstay antennas.
Ease of Installation
No cutting, no swaging, no measuring, no special tools, no special skills required. Simply press fit the GAM/McKim over the existing backstay wire, clamp at bottom and secure in place with included Zip-Ties.  Click here for installation instructions.
Active elements are designed for RF, meaning they are more conductive than the stainless steel backstay wire. Lead wire connections are waterproof and electrically sound. The antenna’s insulated housing reduces precipitation static, often associated with heavy squalls and thunderstorms.
Stowage and Portability
The Split Lead antenna can be coiled up to a diameter of approximately 26” for ease of storage. It can be easily removed when the mast or backstay require work and can readily be transferred from one vessel to another.
The outer housing is very durable, resistant to weathering and, since it is under no mechanical stress, should last for many years in the marine environment.
The GAM/McKim Split Lead Antenna is priced to compete with conventional backstay insulators (including swaging costs) and less expensive than many insulators utilizing reusable terminals.

Out of stock

KISS-SSB Ground Plane for HF Radio

A proper ground plane is key to getting the most out of your SSB Radio. The KISS marine SSB ground plane will maximize the performance of your SSB without underwater holes in the hull or unnecessary wiring.
The KISS-SSB is a US Patented marine SSB ground plane system. This Icom-endorsed principle is the one and only complete antenna counterpoise system.  It does not require any holes under the water-line in the hull for a bronze plate, copper foil, or copper mesh. The system has many feet of exact length wire radials built in.
Unlike other ground plane systems, the KISS is simple to install.  Simply attach one end to your SSB radio, and uncoil the remaining wire anywhere convenient, such as in the bilge.  That's all there is to it - your KISS is ready to go.  Eliminates possible ground loops also!
After a normal installation time of less than thirty minutes, the KISS-SSB is completely maintenance free.  Unlike the bronze plate that requires constant cleaning, and the copper foil that is subject to constant corroding, the KISS-SSB lets you simply enjoy paradise!


Radial Counterpoise Grounding System for Marine or Land use.

This heavy duty performer is designed primarily for boats using HF SSB marine bands. Input power up to 500 watts. Copper conductors are permanently sealed in durable PVC tubing.

All copper conductors. Stainless Steel 5/16 Ring Terminal. Heavy duty 47 inch 10 AWG Marine tinned copper lead connection. Tested with 1.2 to 1 or better SWR on SSB HF frequencies. Tested with 1.2 to 1 or better on 2mhz through 29mhz Ham freq.

Tested with 1.2 to 1 or better on Winlink and Sailmail frequencies.

Technical Specifications:

Frequency: 2-30 MHz HF frequencies with tuner
Radial housing length: 9’ 10”SWR: 1.5 to 1 or better

Impedance: (Ohms): N/A
Connecting lead length 47 inches
Max Input (Watts): 500DC
Ground: N/A 
Termination: One end termination 5/16 ring terminal
Weight 3.5 pounds
Polarization: N/A
Radiation pattern: Omni-directional

Works great with Icom M803 HF/SSB Marine Radio, AT140 Tuner, and GAM's Split-Lead Antenna

ICOM OPC-1147N Shielded Control Cable for M802 and AT-140 Tuner

Shielded Control Cable , MFG# OPC1147N, shielded control cable connects between AT-140 and M802, 10m (32.8ft).

ICOM OPC1465 Shielded Control Cable for M803 and AT-140 Tuner

Shielded Control Cable , MFG# OPC1465, shielded control cable connects between AT-140 and M803, 10m (32.8ft).


Automatic antenna tuner, MFG# AT-140, Matches the transceiver to a long wire or whip antenna with little insertion loss. Cable connections are easy to install.

For M700PRO, M710, M802 and M803.

11″W x 15″H x 3.5″D; Wt: 20 lbs.


Weight (approx.) 2.5 kg; 5.5 lb
Power supply requirement 13.6 V DC (supplied from the HF transceiver)
Current drain Maximum 2 A
Operating temperature range –30°C to +60°C (–22°F to +140°F)
Antenna connector SO-239 (50 Ω)
Maximum Input power 150 W (PEP) 100 W (continuous)
Automatic tuning time Approximately 2 to 3 seconds (general condition) Maximum 15 seconds
Approximately 1 second (re-tuning for a memorized frequency)
Automatic tuning accuracy SWR 2.0:1 (after tuning, except for multiples of 1⁄2 λ)
Usable pole diameter 32 to 60 mm; 1.3 to 2.4 inches

Additional information

Weight 6.8 lbs
Dimensions 17 × 12 × 5 in