Well thats a loaded question the best amateur radio antenna for an HT.. it would be something you would put on the roof of your house, like a cushcraft 13B2 or something, thats what I have if you are lookin for gain. They are around $200 I think maybe a little more. but portable I would use the rubber duck antenna that came with it, it is resonant but no gain, but still works great, contact your local ICOM dealer. DIY external is another story and is way beyond the scope of FixYa as there are hundreds of books on antenna theory.
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Well thats a loaded question the best amateur radio antenna for an HT.. it would be something you would put on the roof of your house, like a cushcraft 13B2 or something, thats what I have if you are lookin for gain. They are around $200 I think maybe a little more. but portable I would use the rubber duck antenna that came with it, it is resonant but no gain, but still works great, contact your local ICOM dealer. DIY external is another story and is way beyond the scope of FixYa as there are hundreds of books on antenna theory.
Hope that helps