Hi Simon,
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I think it depends upon what you are most likely to use it for, and how careful (or careless) you tend to be with kit.
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Most of my applications are indoors, but I have used it up a tower without any problems., as it fits in my top pocket, it's easy to stow away whilst doing other things.
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I also like to be able to store and export data for off-line analysis later, and for me this is a major consideration.
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But if you want a simple-to-read instrument, with big controls, that you can use with gloves on, then maybe a basic, and more conventional, antenna analyser is a better option.
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Horses for courses...
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Regards,
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Martin