Total posts : 45366
Well for starters, the Isotron does not require a ground plane, or in your case, ocean ground.
The name given to the antenna “Isotron” is more than just a name for it. The first three letters are the clue. “ISO”, short for “isolation/isolated”.
This means the antenna does not need a ground plane, which works perfectly for situations like hi-rise apartments or rooftops with limited space to lay down radials.
With the AMT5K’s efficiency, putting most of the RF to the output instead of dissipating in active element heat, the Isotron will perform exceptionally well.
When I used mine, I was driving it with an AMT3K, on a 3rd floor apartment dwelling. It was placed at one end of the room and the transmitter was mounted directly beneath the antenna. The whole thing was mounted on an old music stand tripod with the top of the Isotron about 4 inches from the ceiling. Coverage was rock solid throughout the complex and in each building.
Outdoors it will perform even better, and with the AMT5K should work incredibly well..if the AMT5K output can match up to it’s 50 ohm impedance. Somewhere in the thread abyss is a discussion about the matching up of the AMT5K to a 50 ohm load or Isotron. PhilB should be able to add more additional info on that.