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If it is a planar antenna, just run it at high power for a while, then turn off othe power (so you don't cook yourself) and take an infra-red picture of the antenna. Hot areas have high current, etc. For HF, just hook up a small inductor, detector, and meter and walk around the antenna. Keep the power level under a hundred watts or so and don't spend days doing this kind of thing. If you really want to amaze people, just take a flourescent light and hold it next to the antenna. It lights up where the highest current is.
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