I have a 100 watt RF transmitter with a 600 watt linear one. I'm experimenting with different dipole wire antennas. This device might be a little pricey, but it's built like a tank and is said to handle 1500 watts. I have used it with a plain 20m dipole and am currently using it with a 30m wire dipole which works very well. I was able to get a 1:1 SWR without much trouble. With my 30m dipole, the JT65 allows me to cover a large portion of the US from Southern California at 10W or less. The top ring is for fixing and the two side rings are for connecting the cable from the antenna. The coaxial connector is at the bottom. I've had no problems with RF transmission back to my cabin when using this. I am happy with this purchase Ken - K6WGX
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